A Manufacturer of Stainless Steel Strips
After cutting, it is usually regarded as cold rolled stainless steel coil. It is an extension of ultra-thin stainless steel foil. Moreover, the steel belt is usually slender stainless steel, which can meet the needs of various industrialized mechanical product belts.Yaoyi's stainless steel strip has excellent strength, precision and surface finish, and is widely used in aerospace, petrochemical, automotive, textile, electronics, household appliances, computers and precision processing and other pillar industries.
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Kinds of Stainless Steel Strips
Yaoyi strictly abides by the ISO:9001:2015 management system.
The 201 Stainless steel you need to know
Our stainless steel comes with 200 series, 300, and 400 series. The most typical representative of the 200 series is 201 stainless steel, which is a nickel-saving austenitic stainless steel. This steel grade is widely used in China and can save you money. The excellent physical properties of 201 stainless steel can replace 304 stainless steel under certain conditions. While meeting your mechanical performance requirements, it also enhances the cost-effectiveness of your products.
The 300 series Stainless steel we provide
The most popular 300 series stainless steel is 304 stainless steel. 304 stainless steel has excellent hot workability, weldability, and corrosion resistance.
The semi-hard: Our best selling products
Many of our clients are from spring and clamp companies. They purchase 200 series and 300 series stainless steel belts from us. Therefore, for us, the stainless steel belt is our very important product. Especially the semi-hard stainless steel belt.
The most reliable partners and suppliers
We have cooperated with the best steel factories in China such as Baosteel, TSINGSHAN, TISCO, and Baoxin for more than 20 years and signed procurement contracts. These relationships allow us to provide you with the highest quality and most cost-effective stainless steel belt.
What you can get from us
It's reliable to cooperate with Yaoyi. When you purchase stainless steel belts from yaoyi, the only thing you need to do is telling us the steel grade, thickness, hardness or the usage you need. Yaoyi has been committed to being the best stainless steel belt solution provider.
Steel Grades of Stainless Steel Strips
Yaoyi is always ready to provide you with the best quality stainless steel strips.
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Stainless Steel Strips: The Definitive Guide
We have collected some common questions, if you are going to purchase stainless steel strips, then these answers may help you.
How to buy stainless steel strips？
1. Confirm the required stainless steel strips specifications
You need to communicate with the production department or the design department, to understand-
The thickness, width, and whether to trim the edges;
What hardness or tensile strength is required;
Which is related to the physical properties of the stainless steel strips;
2. Delivery time
You communicate with the production department or the design department to confirm the time or urgency of the need for stainless steel strips so that we can estimate the processing time we need, as well as the current fluctuation range of raw materials in the market, and help you finally complete the purchase. Will not waste your time.
3. Quantity and price
In many cases, the number of stainless steel strips you need will affect the price of stainless steel strips. Because every time we produce one specification of stainless steel, we will produce at least six tons of similar products. If you need a small amount, we need to build an inventory for you. The risk will increase, and these risks may be transferred to the price. come out. If you can tell us what your target price is, we can also predict whether this transaction is acceptable. Save communication costs.
4. Sample confirmation
Usually, after we receive your request, we will send you samples (free of charge) that our existing inventory can meet your requirements. You can confirm with the production or design department after receiving the samples, or you can check the samples Check the final result with the sample and check whether this stainless steel strip sample meets your needs. And please report the problem to us in time, and we will make changes the first time according to your feedback requirements. If the sample is okay, you can place an order with peace of mind, and we will perform mass production and processing according to the specifications of the sample.
5. Request a test report
We have a complete stainless steel strips testing laboratory, and each batch of products will have a corresponding test report; you can ask us to give you this.
What is stainless steel hardness？
Rigidity, strength, and hardness are all indicators of the mechanical properties (or mechanical properties) of materials. Hardness refers to the ability of metal materials to resist harder objects pressed into them. Hardness is a comprehensive mechanical performance index. Generally, materials with high hardness have high strength. The ability of metal materials to resist permanent deformation and fracture under external force is called strength. According to the nature of the external force, there are mainly yield strength, tensile strength, compressive strength, bending strength, etc..
The method to test the hardness
Specifically, hardness is the ability of a material to locally resist the pressing of hard objects into its surface. The most common method to test the hardness of steel is to file on the edge of the workpiece with a file. The depth of the scratches on the surface is used to determine the hardness. This method is called the file test method, but it is not scientific. Using a hardness testing machine to test is more accurate, and it is a common method for modern hardness testing. Commonly used hardness measurement methods include Brinell hardness, Rockwell hardness, and Vickers hardness.
How to measure stainless steel hardness？
According to the classification of metallographic structure, stainless steel plates can be divided into five types: austenitic stainless steel,ferritic stainless steel, austenitic-ferritic stainless steel, martensitic stainless steel, and precipitation hardening stainless steel; also divided into hot-rolled plates And cold-rolled sheets are supplied in various heat treatment states such as annealing, quenching, and tempering, solid solution, quenching or tempering.
How to cut stainless steel strips？
The cutting process
It is a very important link in the welding process and other mechanical processing and manufacturing processes. The cutting quality plays a key role in the processing accuracy and quality of the entire stainless steel strip. Nowadays, laser cutting is the most widely used and best processing precision in the cutting field. Compared with traditional cutting methods, laser cutting has the advantages of high precision, fast efficiency, and good cutting quality, and it is widely used in automobile manufacturing, electronics industry, aerospace, and other fields. The popularity of laser cutting technology has greatly shortened the product manufacturing cycle, saved production costs, and improved product quality.
Use a wide range of cutting methods
The use of wire cutting and fast wire feeding can meet the cutting quality requirements: smooth cutting, no burrs, and high precision. However, it should be noted that the pipe ends will change color after wire cutting, which requires polishing. In addition, the cutting speed is slow, and the emulsified oil required in the cutting process makes the surface of the pipe fittings have oil viscosity, which is not easy to clean. It is also suitable for small batch production.
The automatic hob pipe cutting machine has only circumferential cutting edges and no serrations. Rotating feed, the cut is flat and smooth, without iron filings and burrs, and the inner wall is slightly contracted. By adding special tooling, the necking phenomenon can be greatly improved, and the equipment cost is low. However, when cutting thin-walled stainless steel pipes, tearing occasionally occurs, causing serious deformation of the nozzle.
How stainless steel strips is made？
The stainless steel billets
The billets for hot-rolled stainless steel strip are mainly continuous casting billets and rough rolling billets. With the advancement of continuous casting technology, most of them use continuous cast steel billets, and only a few manufacturers that still use die-cast steel ingots or produce certain special steel grades use roughly rolled billets.
The specifications of the billets for hot rolling are determined comprehensively according to the product specifications, rolling mill capacity, continuous casting specifications, or steel ingots. In order to improve the productivity and yield rate of the rolling mill, the size, and quality of the billets are developing in the direction of large-scale production. The weight of rolled stainless steel strips has reached 8-15t, and the largest has exceeded 20t.
Due to the strict requirements on the surface quality of the stainless steel strip, and the surface of the stainless steel strip is prone to various defects, the blanks before hot rolling must be carefully ground and cleaned, especially the blooms rolled with steel ingots. To remove its surface defects, it is necessary to fully peel and remove subcutaneous defects. The metal loss rate reaches 3%-7%. Among them, the chromium-based stainless steel billet has a lower peeling rate, and the nickel-based stainless steel billet has a higher peeling rate, while the titanium-containing stainless steel billet is Deep grinding is required.
When stainless steel and ordinary carbon steel are rolled in the same set of rolling mills, the stainless steel must be rolled separately in batches to ensure the stability of the stainless steel production process. Generally, the rolling of continuous rolling mill and Steckel rolling mill is divided into two stages of rough rolling and finishing rolling, and the rolling equipment is also divided into two areas of rough rolling and finishing rolling.
The above stainless steel hot rolled coils have been produced.
Cold-rolled stainless steel is basically produced in coils.
The production of cold-rolled stainless steel strip is not a simple "cold rolling" process. The typical production processes of cold-rolled stainless steel strips include heat treatment, pickling, and grinding of hot-rolled steel strips; classification; cleaning, and packaging.
Because there are many varieties of stainless steel and their properties are different, the quality requirements of the products will also be very different. Therefore, there are many production processes for stainless steel cold-rolled steel strips and the production process is more complicated.
For some hot-rolled ferritic and martensitic stainless steels, annealing can be carried out in a continuous furnace, but in actual operation, the annealing process of this type of stainless steel is basically carried out in a bell annealing furnace in advance. On the hot rolling annealing and pickling line, only descaling and pickling are performed. The annealing and pickling treatment on the unit is a hot-rolled austenitic steel coil. Bright annealing is a final annealing treatment method of cold rolling annealing and pickling process, and it is also the product surface processing state required by users-bright heat treatment (surface processing grade NO. 9). The bright annealing unit has a horizontal bright annealing unit, vertical bright annealing unit, and bell type bright annealing furnace. Ferritic and martensitic stainless steel strips are generally carried out in a bell-type bright annealing furnace.
In addition, in order to correct the shape of the stainless steel strip, the finished stainless steel strip needs to be flattened. Although the shape of the stainless steel plate can be corrected once after level, it is necessary to perform a straightening process to produce a completely straight steel strip. Straightening is generally carried out on a roller straightener.
What is the hardness of 304 stainless steel?
We mentioned the hardness of stainless steel, usually 1/4h, 1/2h (half-hard), 3/4h, FH (full-hard) to express the hardness of the stainless steel belt. This expression is divided according to the yield strength of stainless steel.1/4h, 1/2h (half-hard), 3/4h, FH (full-hard) are related to the annealing temperature of the material.
1. 304 stainless steel strips, 1/4h, HV: 150~190, the small external force required for deformation, sufficient toughness, poor elasticity.
2. 304 stainless steel strips, 1/2h (half-hard), HV: 250~300, the moderate external force required for deformation, moderate elasticity, and moderate toughness.
3. 304 stainless steel strips, 3/4h, HV: 310~360. The external force required for deformation is slightly stronger, the elasticity is slightly stronger, and the toughness is slightly stronger.
4. 304 stainless steel strips, FH (full-hard), HV: 370~420. Large external force required for deformation, sufficient elasticity, and poor toughness.
Does stainless steel have a high tensile strength?
When the steel yields to a certain extent, due to the rearrangement of the internal grains, its resistance to deformation increases again. Although the deformation develops rapidly at this time, it can only increase with the increase of the stress until the stress reaches the maximum value. After that, the ability of the steel to resist deformation was significantly reduced, and large plastic deformation occurred at the weakest point, where the section of the test piece quickly shrank, and necking occurred until it broke down. The maximum stress value of steel before fracture is called the ultimate strength or tensile strength.
The following figure shows the tensile strength range of various stainless steels:
What is the packaging standard of stainless steel strips？
1. If the width is less than 40mm, blue plastic wraps all stainless steel strips, and bundles all stainless steel strips with rolled strips. Place a carton ring between the first stainless steel belt and the tray to cushion the pressure. Prevent the carton ring between the last stainless steel band and the pallet.
2. All stainless steel strips over 40mm are plastic wrapped, tied with rolled strips, and placed on a fumigation-free tray.
Requirements: Keep the surface of the stainless steel belt clean. There should be no scratches, cracks, debris, dents, oil/grease, deposits and other impurities on the surface of the stainless steel strips.
What factors limit the hardness of stainless steel?
The strength and hardness
Hardness and tensile strength are the two most commonly used mechanical properties in the inspection of mechanical parts. Hardness determines the use-value of materials to a certain extent, and tensile strength is used as the main parameter to evaluate its carrying capacity.
The relationship between material hardness and tensile strength is positively correlated. As the surface hardness of the material increases, its tensile strength will increase accordingly. Therefore, increasing the reduction rate and adopting a low-temperature and the low-speed rolling process can simultaneously improve the material.
In the production of stainless steel strips, there are two processes that are critical to the subsequent hardness formation of the stainless steel strips.
1. Cold rolled
After long-term production, it has been discovered that during the cold rolling of austenitic stainless steel strips, the strip will undergo work hardening with the increase of the reduction rate, which will increase the strength and hardness while decreasing the plasticity and toughness. But in addition to work hardening, the strength and hardness of the stainless steel strips.
In addition to the increase, the rolling speed and rolling oil temperature will also affect the hardness of the strip after rolling. For example, when rolling 301B stainless steel strip, when the reduction ratio is 66.67% and the rolling oil temperature remains unchanged at 40°C, as the rolling speed increases, the strip hardness decreases from HV568 to HV534, showing a downward trend. When the reduction rate 58.33% and the rolling speed remains unchanged at 100m/min, with the increase of rolling oil temperature, the strip hardness decreases from HV540 to HV533, which also shows a downward trend. When the rolling oil temperature is 40℃ and the rolling speed is 100m/min, the reduction rate is 66.67%.
The hardness of the strip is HV547, and the hardness of the strip with a reduction rate of 58.33% is HV534, so the greater the reduction rate, the more obvious the work hardening of the strip.
Stainless steel strips have extremely high requirements on yield strength, tensile strength, and hardness, in order to ensure that the stainless steel strips have good elasticity when in use. The yield ratio is an important parameter to measure the elastic limit of high-hardness spring steel. The higher the yield ratio, the fatigue limit and toughness of spring steel are also better, these factors directly affect the fatigue life of the spring in use. Taking the production of 301B stainless steel strip as an example, suppose we want to produce 301B stainless steel strip, which is used as a spring. Therefore, 301B is required to ensure good toughness and fatigue limit, and the value of the yield ratio should be above 0.9 to be qualified.
Use continuous thermal tension annealing furnace to anneal 301B cold rolled austenitic stainless steel strip at low temperature. The annealing temperature is 400-550℃ below the recrystallization temperature. The annealing process parameters are selected according to production experience and determined according to the thickness of the strip. 301B after tensile experiments are carried out on the WDW-50D electronic universal testing machine to determine the yield strength and tensile strength, and calculate the yield strength ratio at the same time.
After comparison of experiments, the yield strength and tensile strength of the material after low-temperature stress relief annealing the yield ratio and hardness are greatly improved compared to the cold rolled state. This is because 301B austenitic stainless steel undergoes plastic deformation during rolling and undergoes work hardening. It undergoes a deformation-induced martensitic transformation at room temperature, and along with the crushing of grains, microscopic and macroscopic stresses are generated. On this basis, the cold-rolled strip is carried out at the recrystallization temperature below under low-temperature stress relief annealing, recovery during annealing will release part of the residual stress inside the strip, uniformize the internal stress relaxation of the strip, appropriately reduce the strength and hardness of the strip, and increase the plasticity and toughness of the strip. Improved yield ratio. Aging after annealing leads to an increase in the amount of martensite and transformation strengthening occurs, and transformation strengthening is effective in improving cold rolling.
The effect of the strength and hardness of the tempered strip is greater than that caused by the stress release. Therefore, the mechanical properties of 301B austenitic stainless steel after low-temperature stress relief annealing are improved compared with the cold-rolled state, so that the annealed when the strip is used as spring steel, it is more in line with the performance requirements of the spring.
What is the hs code of stainless steel strips？
To find out the detailed HS code of stainless steel strips, you need to determine the specifications and uses of the stainless steel strips you purchase.
The following are the HS codes of some stainless steel strips:
7219110000—Hot-rolled stainless steel coils with thickness> 10mm;
7219120000——4.75mm≤thickness≤10mm hot-rolled stainless steel coil;
7219131200——3mm≤thickness≤4.75mm hot-rolled stainless steel coils without pickling;
7219131900——other hot-rolled stainless steel coils with 3mm≤thickness≤4.75mm without pickling;
72091510——Spring steel cold rolled steel strip
72091510——Ordinary carbon structure cold rolled steel strip
72091510——shadow mask steel strip for color picture tube
72091510——Battery steel strip for battery steel shell
72091510——ordinary spring steel belt
72091510——cold rolled low carbon steel strip
72091510——Precision alloy cold rolled steel strip
72091510——Titanium alloy precision cold rolled steel strip
72091510.00——Cold rolled steel strip for welded pipe, for battery, for bicycle chain, for automobile structure, for armored cables
72091510.00——Cold rolled low carbon steel strip
72091510.00——Ordinary carbon steel cold rolled steel strip
72091510.00——Cold rolled non-oriented electrical steel strip
72091510.00——Cold rolled toasted blue packaging steel strip
72091510.00——Precision cold rolled steel strip
72091510.00——Cold rolled steel strip for saw blade
72091590——Hardened steel strip
72091590——Double-sided pattern steel belt
72091590——Plain carbon steel belt
72091590——Steel Strip for Lamps
72091590——Button Steel Belt
72091590——Steel belt for mirror box, for motorcycle, for pins, for corrugated pipe
72091590——Special cold rolled steel strip
72091590——Cold rolled steel strip
7220110000——The thickness of hot-rolled stainless steel strips ≥4.75mm
7220120000——The thickness of hot-rolled stainless steel strips <4.75mm
7220202000——Cold-rolled stainless steel strip with thickness ≤0.35mm
7220203000——Cold rolled stainless steel strip with 0.35mm<thickness<3mm
What are the stainless steel finishes?
Introduction to the more common types of stainless steel surface treatment:
Processing method and surface characteristics
A rough, matte surface that is hot rolled to a specified thickness and then annealed and descaled.
Tanks, chemical industrial plants, etc.
The matt cold-rolled product produced by heat treatment and pickling after cold rolling has a soft material and a silver-white surface.
Deep drawing processing, such as automotive components, water pipes, etc.
After NO.2D treatment, the final pass is lightly cold rolled by a polishing roller to obtain proper gloss. This is the most commonly used surface finishing, which can also be used as the first step of polishing.
Products polished with 100-120 abrasive belts. It has better gloss and discontinuous rough lines.
Building interior and exterior decoration materials, electrical products and kitchen equipment, etc.
The product is polished with grit size 150～180 abrasive belt. It has better gloss, discontinuous rough lines and finer stripes than No.3. Stainless steel castings commonly used polished and sanded surfaces.
Used in bathrooms, interior and exterior decoration materials of buildings, electrical products, kitchen equipment and food equipment, etc.
Products polished with No. 320 polishing abrasive belt. It has better gloss, discontinuous rough lines and finer stripes than No.4.
Used in bathrooms, interior and exterior decoration materials of buildings, electrical products, kitchen equipment and food equipment, etc.
Use 600# rotary polishing wheel for grinding to obtain a mirror-polished surface.
For art and decoration
Use a polishing abrasive belt with an appropriate particle size (150-320 mesh) to grind, so that No. 4 produces a continuous hairline brushed surface.
Building decoration, elevators, building doors, panels, etc.
The use of pitted rollers can reduce the gloss of No.2B and generate pits, which can also reduce the reflection effect.
It is mostly used in home appliances, small mirrors, kitchen equipment and building materials that require high reflectivity.
There is no clear standard. After cold rolling, the products that have undergone bright annealing heat treatment and tempered and rolled have high surface reflectivity. Or use a cloth wheel to polish the obtained mirror-polished surface.
Mainly used for interior and exterior decoration materials of automobiles and buildings.