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A285/A285M GrC
keyword A285/A285M GrC Category Steel pipe material Related products Get a quoteA285/A285M GrC material spiral steel pipe
1、 Material characteristics and applicability
Chemical composition
Carbon (C): 0.24%~0.28%, balancing strength and weldability.
Manganese (Mn): 0.70%~1.50%, enhances thermal processing performance and toughness.
Phosphorus (P) and sulfur (S): both ≤ 0.035%, reducing the risk of hot cracking.
Mechanical properties
Yield strength: ≥ 205~275 MPa (different standard requirements).
Tensile strength: 380~515 MPa, meeting the requirements of medium and low pressure bearing.
Elongation rate: ≥ 22% (gauge length 200mm), ensuring forming ductility.
Processing performance
Weldability: Low carbon design compatible with submerged arc welding (SAW).
Delivery status: Hot rolled, controlled rolling or normalized state, coil forming stability.
2、 Key points of spiral steel pipe production process
Raw material pretreatment
The strip steel needs to be leveled, trimmed and planed, and rolled with precision.
Thickness range: 8-150mm, width up to 3900mm, supporting the production of large-diameter spiral pipes.
Forming and Welding
Spiral rolling: using roll forming, controlling the gap between welds by 1-3mm, reducing the amount of misalignment.
Double sided submerged arc welding: Lincoln welding machine for single/double wire welding, with parameters matching material characteristics (preheating temperature 100~150 ℃).
Quality inspection
Non destructive testing: Ultrasonic (UT) and X-ray (RT) testing cover 100% of the weld seam, and repair and retest after defect marking.
Hydrostatic test: Radial seal pressure test, parameters automatically recorded and printed.
3、 Application scenarios and execution standards
Applicable fields
Oil and gas transportation: medium and low pressure natural gas, petroleum pipelines.
Chemical equipment: supporting pipelines for storage tanks and pressure vessels.
Infrastructure projects: water supply, thermal pipelines, etc.
Execution standards
Material standard: ASME A285/A285M (American standard).
Steel pipe standards: API 5L (spiral welded pipe for structural use), ASTM A53 (universal fluid pipe).
4、 Production suggestions and limitations
Process optimization
Thick plates (>20mm) require an additional preheating process to avoid welding cold cracks.
Controlled rolling steel plates can improve material homogeneity and reduce internal stress.
Usage restrictions
Temperature range: Recommended -20 ° C~400 ° C, impact toughness needs to be verified in low-temperature environments.
Pressure upper limit: applicable to medium and low pressure systems with a design pressure ≤ 2.5MPa.
Through material performance adaptation and process control, A285/A285M GrC spiral steel pipes can be widely used in the energy and industrial fields. It is necessary to strictly follow standard specifications and strengthen weld quality monitoring.
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