TORICH INTERNATIONAL LIMITED
| Payment Terms | L/C,D/A,D/P,T/T,Western Union,MoneyGram |
| Supply Ability | 60000 Ton/Tons per Year |
| Delivery Time | 20-40days |
| Packaging Details | In bundles or in wooden boxes. |
| Material | Carbon structural steel |
| Standard | GB/T 31315-2014 |
| Grade | Q195; Q215; Q235; Q275; Q345 |
| Outer Diameter | Custom according to drawing and tolerance class |
| Wall Thickness | Custom according to drawing and tolerance class |
| Length | 1-12 m, customizable |
| Straightness | ≤ 1.5 mm/m; for OD > 16 mm, full-length curvature ≤ 0.1% of total length |
| Heat Treatment | +C cold finished hard, +LC cold finished soft, +SR stress relieved, +A annealed, +N normalized |
| Brand Name | TORICH |
| Model Number | GB/T 31315 |
| Certification | ISO9001 ISO14001 TS16949 |
| Place of Origin | ZheJiang/China |
View Detail Information
Explore similar products
Carbon Steel Cold Drawn Bright Shock Absorber Tube Precision Steel Tube for
ERW Precision Steel Tubes ERW Precision Tubes
High Tolerance Seamless Steel Tubes / Precision Steel Pipe Pipe For Automotive
Torich GB/T13793 Q195 Welded Steel Tube ERW Precision Steel Tube
Product Specification
| Payment Terms | L/C,D/A,D/P,T/T,Western Union,MoneyGram | Supply Ability | 60000 Ton/Tons per Year |
| Delivery Time | 20-40days | Packaging Details | In bundles or in wooden boxes. |
| Material | Carbon structural steel | Standard | GB/T 31315-2014 |
| Grade | Q195; Q215; Q235; Q275; Q345 | Outer Diameter | Custom according to drawing and tolerance class |
| Wall Thickness | Custom according to drawing and tolerance class | Length | 1-12 m, customizable |
| Straightness | ≤ 1.5 mm/m; for OD > 16 mm, full-length curvature ≤ 0.1% of total length | Heat Treatment | +C cold finished hard, +LC cold finished soft, +SR stress relieved, +A annealed, +N normalized |
| Brand Name | TORICH | Model Number | GB/T 31315 |
| Certification | ISO9001 ISO14001 TS16949 | Place of Origin | ZheJiang/China |
| High Light | mild steel precision round tube ，precision metal tubing ，precision seamless steel tube | ||
GB/T 31315 Q195 cold rolled precision welded steel tube is a cold-sized mechanical tube designed for applications requiring tighter dimensional control, cleaner surfaces, and superior formability compared to ordinary ERW structural pipe. Governed by GB/T 31315-2014 standard, this product covers cold drawn or cold rolled precision welded steel tubes for machinery, vehicle, furniture, and general engineering applications. Q195 is one of the specified steel designations with chemistry referenced to GB/T 700.
| Item | Description |
|---|---|
| Material | Carbon structural steel |
| Standard | GB/T 31315-2014 |
| Grade | Q195 |
| Outer Diameter | Custom according to drawing and tolerance class |
| Wall Thickness | Custom according to drawing and tolerance class |
| Length | 1-12 m, customizable |
| Tolerance Range | As agreed under GB/T 31315 dimensional tolerance requirements; non-roundness and wall thickness unevenness shall not exceed 80% of the respective tolerance |
| Straightness | ≤ 1.5 mm/m; for OD > 16 mm, full-length curvature ≤ 0.1% of total length |
| Surface Condition | Cold rolled / cold drawn surface; smooth inner and outer surfaces; phosphate and lubricant film permitted in cold-finished delivery; oxide film permitted after heat treatment if non-loose |
| Heat Treatment | +C cold finished hard, +LC cold finished soft, +SR stress relieved, +A annealed, +N normalized |
Q195 is a mild carbon structural steel with C ≤ 0.12%, Si ≤ 0.30%, Mn ≤ 0.50%, providing high plasticity, excellent weldability, and reliable cold-forming behavior for sleeves, brackets, bushings, furniture frames, and light mechanical members.
GB/T 31315 is a precision tube standard that controls tube geometry, curvature, surface condition, and dimensional consistency for applications where normal ERW pipe is too coarse for machining, telescoping, pressing, or sliding fits.
The standard requires smooth inner and outer surfaces, with local pits, scratches, and minor marks limited to a depth of 0.08 mm max, while remaining wall thickness must still stay above the minimum allowed tolerance. This is crucial for parts that will be bent, plated, painted, or directly assembled.
Q195 typically provides yield strength ≥ 195 MPa, tensile strength 315-430 MPa, and elongation ≥ 33% for small-section reference products, making it suitable where formability is more important than high load-bearing capacity.
The key difference is the execution standard. GB/T 31315 is specifically written for cold drawn or cold rolled precision welded steel tubes for mechanical and automotive use, with requirements on dimensional accuracy, curvature, surface finish, and inspection.
GB/T 31315 references GB/T 7735-2004 eddy current testing and includes flattening and drift-expanding tests in its inspection framework. Manufacturers perform comprehensive checks including chemistry, tensile tests, flattening, flaring, NDT, surface inspection, and dimensional verification.
Professional buyers prioritize stable chemistry, straightness, and surface quality. GB/T 31315 addresses all three through referenced chemistry standards, curvature limits of 1.5 mm/m and 0.1% full length for OD over 16 mm, and local surface defect depth limit of 0.08 mm, reducing rework during cutting, fixture assembly, bending, and coating.
| Standard System | Reference |
|---|---|
| GB | GB/T 31315-2014 -- Cold drawn or cold rolled precision welded steel tubes for mechanical structures; chemistry for Q195 is referenced to GB/T 700 |
| ASTM | ASTM A513 -- Welded carbon and alloy mechanical tubing; commonly used as the nearest North American mechanical tubing reference |
| EN | EN 10305-3 -- Welded cold-sized steel tubes for precision applications |
| GOST | GOST 9567 -- Precision steel pipes; commonly used as the closest Russian precision tube reference |
| JIS | JIS G3445 -- Carbon steel tubes for machine structural purposes |
Automotive seat guide sleeve -- Q195 precision welded tube is suitable for light-load seat guide sleeves and similar formed mechanical parts where straightness, weldability, and consistent outside diameter are more important than high structural strength. This aligns with the standard's intended fields of machinery, vehicle, furniture, and general engineering manufacture.
| Grade | Standard Reference | C max % | Si max % | Mn max % | P max % | S max % |
|---|---|---|---|---|---|---|
| Q195 | GB/T 700 | 0.12 | 0.30 | 0.50 | 0.035 | 0.040 |
| Q215A | GB/T 700 | 0.15 | 0.35 | 1.20 | 0.045 | 0.050 |
| Q235B | GB/T 700 | 0.20 | 0.35 | 1.40 | 0.045 | 0.045 |
| Q275B | GB/T 700 | 0.21 | 0.35 | 1.50 | 0.045 | 0.045 |
| Q345B | GB/T 1591 | 0.20 | 0.50 | 1.70 | 0.035 | 0.035 |
| Grade | Reference Thickness | Yield Strength min MPa | Tensile Strength MPa | Elongation min % |
|---|---|---|---|---|
| Q195 | ≤ 16 mm | 195 | 315-430 | 33 |
| Q215A | ≤ 16 mm | 215 | 335-450 | 31 |
| Q235B | ≤ 16 mm | 235 | 370-500 | 26 |
| Q275B | ≤ 16 mm | 275 | 410-540 | 22 |
| Q345B | ≤ 16 mm | 345 | 470-630 | 20 |
Company Details
Business Type:
Manufacturer,Distributor/Wholesaler,Importer,Exporter,Trading Company,Seller
Year Established:
1997
Total Annual:
25000000-30000000
Employee Number:
100~200
Ecer Certification：
Verified Supplier
A Professional Steel Pipes Materials Inventor, Manufacturer And Solution Provider TORICH INTERNATIONAL LIMITED is a professional inventor, manufacturer, and solution provider of steel pipe materials, integrating production and international trade, specializing in various precision steel pipes. Esta... A Professional Steel Pipes Materials Inventor, Manufacturer And Solution Provider TORICH INTERNATIONAL LIMITED is a professional inventor, manufacturer, and solution provider of steel pipe materials, integrating production and international trade, specializing in various precision steel pipes. Esta...
Get in touch with us
Leave a Message, we will call you back quickly!