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Stainless Steel 316L Flat Bar

Size range:
Thickness: 0.5mm - 200mm
Width: 1.5mm - 250mm
Material: Grade 316L (UNS S31603/1.4404)
Type: Flat Bar/Flat Steel/Flat Plate
Used in: Oil, Offshore, Water, Ship, Natural Gas, Power, Pipe Projects etc


Product Name  316L Flat Bar
Material  304,304L,309S,310S,316,316L,316Ti,317,317L,321,347H,2021,202,405,409,410,420,430,etc
Type  Round bar, square bar, hexagonal bar, flat bar, angle bar
Surface  Pickled, Black, Bright, Polishing, Blasting, etc
Specification  Round Bar  Diameter: 3mm~800mm
Angle Bar  Size:   3mm*20mm*20mm~12mm*100mm*100mm
Square Bar  Size:   4mm*4mm~100mm*100mm
Flat Bar  Thickness: 2mm~100mm
Width: 10mm~500mm
Hexagonal  Size: 2mm~100mm
Quality test we can offer MTC (mill   test certificate)

What is a flat bar?

Flat bar refers to steel with a width of 12-300mm, a thickness of 3-60mm, a rectangular section and a slightly blunt edge. Flat bar can be finished steel, or it can be used as blank for welded pipe and thin slab for laminated sheet.

20230104003011 50611 - Stainless Steel 316L Flat Bar

Characteristics of flat bar

Special product specifications. The thickness is 8-50mm, the width is 150-625mm, the length is 5-15m, and the product specification span is dense, which can meet the needs of users. Instead of using medium plates, welding can be carried out directly without cutting.
The surface of the product is smooth and clean. High pressure water descaling process is adopted for the second time in the process to ensure smooth and clean steel surface.
Both sides are vertical and the water chestnut is clear. The second vertical rolling in finishing rolling ensures good perpendicularity of both sides, clear angle and good edge surface quality.
The scale of the product is accurate, and the difference between three points and the same level is better than the steel plate standard; The product is straight and of good shape. Continuous rolling process and automatic looper control are adopted for finish rolling to ensure no steel stacking and no steel pulling. The product has high dimensional accuracy, and the tolerance range, three-point difference, same strip difference, sickle bending and other parameters are superior to the medium plate, and the flatness of the plate is good. Cold shearing, with high precision of length and sizing.
The product material adopts the national standard, which is the same as the steel plate. The quality and technical standards shall be produced according to YB/T4212-2010 (for Q345B/Q235B, refer to GB/T1591-94 and GB/T700-06 respectively).

Advantages of flat bar

The flat bar is rolled with positive deviation, but delivered according to the actual weight, and the utilization rate is 1-5 percentage points higher than that of the steel plate.
Flat bar can be produced with fixed thickness, width and length according to user requirements, which reduces cutting, saves processes, reduces labor and material consumption, and also reduces the processing loss of raw materials, saving time, labor and materials. The products have been specialized in steel structure manufacturing, machinery manufacturing, automobile industry, mining machinery, hoisting machinery and other industrial materials.

Process flow of flat bar

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Processing process of longitudinal shear flat bar
The working principle of flat bar finishing machine for precision flat bar production process is to pre level and finally level the cold flat bar rough with the thickness direction of two groups of leveling wheels arranged up and down alternately; A pair of relatively arranged finishing wheels are used to extrude the width direction, so that the width is compressed to reach the expected parameters, and the compression amount is adjustable; Straighten the width with 5 straightening wheels staggered. This system is mainly composed of control box, finishing press roll, pre leveling unit, finishing unit and straightening unit.

The production process can be summarized as: pre leveling → finishing → straightening → post leveling. Flat bar/a/b: steel with width of 12-300mm, thickness of 4-60mm, rectangular section and a little pure edge. Flat bar can be finished steel, or it can be used as blank for welded pipe and thin slab for laminated sheet. Main applications: Flat bar can be used as finished material to make hoop iron, tools and mechanical parts, and it can be used as building frame structural parts and escalators. Flat bar is divided into two types according to its shape: plane spring flat bar and single side double groove spring flat bar. Hot rolled spring flat bar is mainly used to manufacture leaf springs for automobiles, tractors, railway transportation and other machinery.

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Process Method of Flat Spring Steel for Automobile

Spring flat bar is made by converter smelting process. Compared with the prior art, it has the following advantages and positive effects:

  • 1. The converter is used to smelt flat bar, mainly using molten iron as raw material. There are few harmful elements in molten iron, and the quality of the produced flat bar is guaranteed.
  • 2. Due to high yield and low power consumption, the cost per ton is lower than that of electric furnace.
  • 3. The molten steel is directly cast into billets, which omits the billet opening process and reduces the cost.
  • 4. The constant length rate of continuous casting billet is high, which can ensure the constant length rate of flat bar and meet the needs of users.

Grade Chemical Composition (%)
  C Si Mn P S Ni Cr Mo
201 ≤0.15 ≤1.00 5.5~7.5 ≤0.060 ≤0.030 3.50~5.50 16.00~18.00  
301 ≤0.15 ≤1.00 ≤2.00 ≤0.045 ≤0.030 6.00~8.00 16.00~18.00  
302 ≤0.15 ≤1.00 ≤2.00 ≤0.045 ≤0.030 8.00~10.00 17.00~19.00  
304 ≤0.08 ≤1.00 ≤2.00 ≤0.045 ≤0.030 8.00~10.50 18.00~20.00
304L ≤0.030 ≤1.00 ≤2.00 ≤0.045 ≤0.030 9.00~13.50 18.00~20.00
316 ≤0.045 ≤1.00 ≤2.00 ≤0.045 ≤0.030 10.00~14.00 10.00~18.00 2.00~3.00
316L ≤0.030 ≤1.00 ≤2.00 ≤0.045 ≤0.030 12.00~15.00 16.00~18.00 2.00~3.00
430 ≤0.12 ≤0.75 ≤1.00 ≤0.040 ≤0.030 ≤0.60 16.00~18.00
430A ≤0.06 ≤0.50 ≤0.50 ≤0.030 ≤0.50 ≤0.25 14.00~17.00

Drawing & Formula of Flat Bar

20230103234310 98133 - Stainless Steel 316L Flat Bar

Formula: m = A (mm) × THK (mm) × L (m) × 0.00793

  • * For 316, 316L, 310S, 309S, etc., ratio=0.00798. For 400 series stainless steel, ratio=0.00775
  • A = Side width, THK = Thickness, L = Length
Tolerance for Hot Rolled Flat Bars
Size Tolerance Rank
Group 1 Group 2 Group 3
>7 ~ ≤20 ±0.25 ±0.35 ±0.40
>20 ~ ≤30 ±0.30 ±0.40 ±0.50
>30 ~ ≤50 ±0.40 ±0.50 ±0.60
>50 ~ ≤80 ±0.60 ±0.70 ±0.80
>80 ~ ≤110 ±0.90 ±1.00 ±1.10
>110 ~ ≤150 ±1.20 ±1.30 ±1.40
Tolerance for Hot Forging Flat Bars
Size Tolerance Rank
Group 1 Group 2
>50 ~ ≤60 0.5 1
>60 ~ ≤80 1 1.5
>80 ~ ≤100 1.5 2
>100 ~ ≤120 1 1.5
>120 ~ ≤140 1.5 2
>140 ~ ≤160 1 2
>160 ~ ≤180 2 3
>180 ~ ≤200 3 4
>200 ~ ≤220 2 3
>220 ~ ≤240 3 4
>240 ~ ≤250 4 5
>250 ~ ≤300 5 6
Tolerance for Cold Drawn Flat Bars
Size Tolerance Rank
H8 H9 H10 H11 H12 H13
3 0 ~ -0.014 0 ~ -0.025 0 ~ -0.040 0 ~ -0.060 0 ~ -0.100 0 ~ -0.140
>3 ~ ≤6 0 ~ -0.018 0 ~ -0.030 0 ~ -0.048 0 ~ -0.075 0 ~ -0.120 0 ~ -0.180
>6 ~ ≤10 0 ~ -0.022 0 ~ -0.036 0 ~ -0.058 0 ~ -0.090 0 ~ -0.150 0 ~ -0.220
>10 ~ ≤18 0 ~ -0.027 0 ~ -0.043 0 ~ -0.070 0 ~ -0.110 0 ~ -0.180 0 ~ -0.270
>18 ~ ≤30 0 ~ -0.033 0 ~ -0.052 0 ~ -0.084 0 ~ -0.130 0 ~ -0.210 0 ~ -0.330
>30 ~ ≤50 0 ~ -0.039 0 ~ -0.062 0 ~ -0.100 0 ~ -0.160 0 ~ -0.250 0 ~ -0.390
>50 ~ ≤80 0 ~ -0.046 0 ~ -0.074 0 ~ -0.120 0 ~ -0.190 0 ~ -0.300 0 ~ -0.460
Delivery State Choice
Surface Condition
Forged Pickled
Hot Rolled Sand Blasting
Cold Drawn Bright
1. If you require different deliver state than the above listed, kindly confirm with us.
2. In case of any enquiry or order, please kindly let us know any extra requirement not indicated here.

Standards for AISI 316L Flat Bar

Material No. EN Designation UNS AISI/SAE
1.4404 X2CrNiMo17-12-2 S31603 316L

Chemical Composition of AISI 316L Flat Bar

C ≤% Si ≤% Mn ≤% P ≤% S ≤% Cr % Mo % Ni %
0.030 1.00 2.00 0.045 0.030 16.0-18.0 2.00-3.00 10.00-14.0

2015826133374395709 1 - Stainless Steel 316L Flat Bar

Mechanical Properties 20℃ of AISI 316L SS Flat Bar

0.2% Yield Strength Rp≥N/mm2 Tensile Strength        RmN/mm2 Elongation A5
Modulus of Elasticity
kN/ mm2
200 500-700 40/30 200

Physical Properties 20℃ of AISI 316L SS Flat Bar

Density g/cm3 Specific Heat Capacity  J/kg K Thermal Conductivity
W/m K
Electrical Resistivity
7.98 500 15 0.75

Application of Flat Bar

Flat bars are a metal with a rectangular cross-section and uniform thickness. They are versatile and practical and can be used in a variety of applications. In this blog post, we will explore some of the ways in which flat steel can be used in different industries and projects.
One common use for flat steel is in construction. They can be used to support beams, bracing or reinforcing bars in concrete. Flat bars can also be used to create parapets or railings around a construction site, or to create window and door frames.
Flat bars are also often used in manufacturing. They can be used in the manufacture of mechanical parts, as well as in the production of automotive and aircraft components. Flat bars are often used in the production of structural steel, as they provide strong and stable support.
Flat bars can also be found in the food industry, where they are used in the manufacture of food processing equipment. They are durable and easy to clean, making them ideal for use in this industry.
In the transportation industry, flat bars are used in the construction of trailers and other vehicles. They provide strong and stable support for the weight of the vehicle and its contents.
Flat bars are also used in the construction of outdoor furniture and playground equipment. Their ruggedness and ability to withstand the elements make them ideal for these applications.
Overall, flat bars are a practical and versatile option for a variety of applications. They are rugged and easy to use, making them ideal for a variety of industries and projects.

Packing & Shipping of Flat Bars

Packing and shipping flat bars may seem like a simple task, but it is important to take the proper precautions to ensure that your product arrives safely at its destination without any damage. The following are some tips for packing and transporting flat bars.

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  • Choose the right packaging materials: It is important to use packaging materials that will protect your flat bars during shipping. Bubble wrap, foam sheets and foam rolls are all good options for protecting your flat bars from bumps and shocks during shipping.
  • Measure and weigh your flat bars: Make sure you have the correct size box and enough packing material to properly secure your flat bars. It is also important to accurately measure and weigh your package so you can properly mark and select the correct shipping method.
  • Properly mark your package: Make sure to clearly mark your package with the destination address and return address. It is also a good idea to include a packing slip or invoice with your package to help cover any customs or brokerage fees.
  • Choose the right shipping method: When choosing a shipping method, consider the size and weight of your package, as well as the distance it will need to travel. You need to choose a method that is cost effective and will get your flat bar to its destination in a timely manner.

By following these simple tips, you can ensure that your flat bars are packaged and shipped safely and securely. Happy shipping!

How to purchase high-quality flat bar?

Are you looking for a high quality flat bar? Flats are a versatile and useful material in a variety of construction and fabrication projects. They provide a strong and stable support surface that can be used in everything from framing to bracing.
When purchasing flat panels, there are several key factors to consider to ensure you get the best quality product for your needs. Here are some tips to help you purchase high quality flat panels.
Determine your needs: Before you start buying a flat bar, it’s important to know exactly what you need it to do. Consider the size, thickness and strength requirements of your project. This will help you narrow down your choices and ensure you get a flat bar that fits your needs.
Look for a reputable manufacturer: Not all flat bars are created equal. To ensure you get a quality product, it’s important to buy from a reputable manufacturer. Look for a company that has a proven track record of producing durable and reliable flat bars.
Check the material: The material of the flat bar has a big impact on its strength and durability. Look for flat bars made from quality materials, such as steel or aluminum. These materials are strong, durable and resistant to wear and tear, making them ideal for long-term projects.
Consider the finish: The finish on a flat bar can also affect its durability and appearance. Look for flat bars with high-quality finishes, such as powder coating or anodizing. These finishes help protect the material from corrosion and wear, and can give flat bars a professional appearance.
Read reviews: Before you buy, it may be helpful to read reviews from other customers who have used flat panels. This can give you an idea of the quality and performance of the product.
By following these tips, you can confidently purchase a quality flat plate that meets the needs of your project.

How to find high quality flat bar manufacturer?

Are you looking for a high quality manufacturer of flat bar? we’ll cover some tips on how to find the perfect manufacturer for your flat bar needs.
First and most importantly, it’s important to do your research. Look for manufacturers that have a proven track record of producing high quality flat bar. You can do this by reading online reviews and seeking recommendations from other industry professionals. It’s also a good idea to check the manufacturer’s website to see what they are capable of and to see if they have any certifications or accreditations.
Next, consider the type of flat bar you need. Different manufacturers may specialize in different types of flat bar, such as stainless steel, aluminum, or carbon steel. Make sure the manufacturer you choose has experience using the type of flat bar you need.
It is also important to consider the amount of flat bar you will need. Some manufacturers may have minimum order requirements, so it’s important to make sure the manufacturer you choose can meet your needs.
Another factor to consider is the manufacturer’s location. If you need to ship flat bar, it may be more cost effective to choose a manufacturer that is closer to your business.
Finally, don’t be afraid to negotiate. Many manufacturers will be willing to work with you to find a price that works for both parties.
By following these tips, you can find a quality flat steel manufacturer that meets your needs and fits your budget.
China Flat Bar Manufacturer offers Stainless Steel 316L Flat Bar.

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