| Customization: | Available |
|---|---|
| Application: | Automotive Industry, Chemical Industry, Food Industry, Oil and Gas Industry, Pharmaceutical Industry, Heat Exchanger |
| Certification: | CE, ISO9001 |
|
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Primary Standard: GB 3087-2008 (Chinese National Standard for Boiler Tubes)
Equivalent Standards:
ASTM A106 Gr.B (International Equivalent)
EN 10216-2 (European Standard)
JIS G3461 (Japanese Standard)
| Parameter | Tolerance (GB 3087-2008) |
|---|---|
| OD Tolerance | ±1.0% (Hot-Rolled) / ±0.5% (Cold-Drawn) |
| WT Tolerance | +12.5%, -10% |
| Straightness | ≤1.5 mm/m |
High-Temperature Stability - Suitable for steam boilers ≤450°C
Weldability - Low carbon content (C ≤0.24% for 20#) prevents cracking
Cost-Effective - More economical than ASTM A213 for non-critical services
Chemical Composition (20# Steel):
| Element | Requirement |
|---|---|
| C | 0.17-0.24% |
| Si | 0.17-0.37% |
| Mn | 0.35-0.65% |
| P | ≤0.035% |
| S | ≤0.035% |
Mechanical Tests:
Tensile Strength: ≥410 MPa (20#)
Yield Strength: ≥245 MPa (20#)
Flattening Test: No cracks at 2/3 of original OD
Power Plants: Low/medium-pressure boiler tubes, superheaters
Chemical Industry: Heat exchangers, condensers
Oil Refineries: Pipeline systems (non-H2S environments)
Export Packaging: Anti-rust oil coating + waterproof wrapping
Certification: GB 3087-2008 MTC with heat number traceability
| Property | GB 3087 20# | ASTM A106 Gr.B |
|---|---|---|
| C Content | 0.17-0.24% | ≤0.30% |
| Tensile (MPa) | ≥410 | ≥415 |
| Max Temp | 450°C | 425°C |
Hot-Rolled Tubes: Air-cooled after rolling
Cold-Drawn Tubes: Stress-relieved at 600-650°C
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