GB/T 24187 Cold-Drawn Precision Single Welded Steel Tubes For Mechanical
GB/T 24187 Cold-Drawn Precision Single Welded Steel Tubes
GB/T 24187 specifies the technical necessities for cold-drawn precision unmarried welded metallic tubes specially used in mechanical applications. those tubes are synthetic to meet strict dimensional, mechanical, and chemical requirements, offering high accuracy and steady overall performance in engineering applications.
Material
The fabric used in GB/T 24187 tubes is normally carbon metal or low alloy steel. these steels are decided on for his or her incredible weldability, mechanical electricity, and floor satisfactory after bloodless drawing. The tubes go through bloodless drawing to improve dimensional accuracy, floor finish, and mechanical residences.
Specification
- popular: GB/T 24187
kind: bloodless-drawn precision single welded steel tubes
production technique: electric resistance welding (ERW), observed by using bloodless drawing
Diameter range: typically from 10 mm to 100 mm (custom sizes available)
Wall Thickness: ranges usually from 1 mm to eight mm
duration: preferred or as particular by means of the client
surface finish: easy, with elective coating for corrosion protection
Chemical Composition
The chemical composition limits for common grades under GB/T 24187 are as follows:
| Element | C (Steel Grade) | Mn | Si | P (max) | S (max) | Other Elements |
|---|---|---|---|---|---|---|
| Typical Grade 1 (e.g. Q195) | 0.06-0.12% | 0.30-0.50% | ≤0.30% | ≤0.035% | ≤0.035% | - |
| Typical Grade 2 (e.g. Q215) | 0.12-0.18% | 0.30-0.70% | ≤0.30% | ≤0.035% | ≤0.035% | - |
| Typical Grade 3 (e.g. Q235) | 0.12-0.20% | 0.30-0.70% | ≤0.30% | ≤0.035% | ≤0.035% | - |
Mechanical Properties
| Property | Q195 Grade | Q215 Grade | Q235 Grade |
|---|---|---|---|
| Tensile Strength | 270 - 410 MPa | 300 - 440 MPa | 370 - 500 MPa |
| Yield Strength | ≥ 195 MPa | ≥ 215 MPa | ≥ 235 MPa |
| Elongation (%) | ≥ 26% | ≥ 23% | ≥ 20% |
| Hardness (HB) | 110 - 140 | 120 - 150 | 130 - 170 |
Key Features
- excessive dimensional precision due to cold drawing process
great floor end with minimum defects
right weldability and constant mechanical residences
advanced straightness and uniformity alongside period
to be had in numerous sizes and thicknesses to match unique engineering needs
Meets strict countrywide widespread requirements for metallic tubes
Application
GB/T 24187 cold-drawn precision unmarried welded metal tubes are widely utilized in:
- Mechanical production and engineering components
automotive components inclusive of guidance, suspension systems
Hydraulic and pneumatic cylinders
Precision equipment and instruments
furnishings production
production frameworks requiring precision and energy
Equivalent Grades
equivalent or comparable international requirements and grades consist of:
| Chinese Grade | ASTM Equivalent | EN Equivalent | JIS Equivalent |
|---|---|---|---|
| Q195 | ASTM A513 Gr. 1010 | EN 10305-3 E195 | JIS G3444 STKM 11A |
| Q215 | ASTM A513 Gr. 1015 | EN 10305-3 E215 | JIS G3444 STKM 12A |
| Q235 | ASTM A513 Gr. 1020 | EN 10305-3 E235 | JIS G3444 STKM 13A |
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