ASTM A36 Carbon steel pipe

ASTM A36/A36M - Standard Specification for Carbon Structural Steel

This specification covers carbon steel shapes, plates, and bars of structural quality for use in riveted, bolted, or welded construction of bridges and buildings, and for general structural purposes. ASTM A36 steel is a widely used American standard low-carbon carbon structural steel.

ASTM A36 (ASME SA36) conforms to the standards of the American Society for Testing and Materials, and the ordinary carbon steel pipes produced according to the ASME standards are equivalent to China's Q235 material, which belongs to the American Standard and Common carbon steel plate.

ASTM A36 is suitable for riveting, bolting and welding structures used in bridges and buildings, and is often used in machinery manufacturing. ASTM A36 has good cutting and welding performance. In terms of cutting processing, it has stable performance, small cutting deformation and is easy to weld. It is widely used in manufacturing industries such as heavy equipment spare parts manufacturing, metallurgy and chemical industry, and flanges.

Implementation Standard of ASTM A36: ASTM A36/A36M-03a.

Chemical elements and composition of ASTM A36:

1. Elements: C (carbon), Si (silicon), Mn (manganese), P (phosphorus), S (sulfur), Cu (copper)
2. Composition: C: ≤0.25, Si≤0.40, Mn: ≤0.80-1.20, P≤0.04, S: ≤0.05, Cu≥0.20. (in the case of copper-containing steel)

Features: Low carbon content (<0.3%) makes it easy to weld and has good processing performance, but poor corrosion resistance (surface treatment is required)

Thickness range: 8mm~500mm (some manufacturers can produce 6mm~700mm)

ASTM A36 technical requirements: flaw detection, Z15Z35 thickness direction performance requirements, high strength, high toughness and other requirements.

Advantages of ASTM A36 carbon steel:
1. Excellent welding performance: suitable for manual arc welding, gas shielded welding and other methods.
2. Convenient processing: can be cut, drilled, bent, suitable for mechanical processing (processability 72%).
3. Low cost: more competitive price than alloy steel.
4. Strong versatility: widely used in structural parts, no complex heat treatment required.

Disadvantages: low strength (not suitable for ultra-high pressure environment), poor corrosion resistance (need to be galvanized or painted)

Typical applications of A36 steel:
Building structure: steel structure frame, bridge, tower.
Machinery manufacturing: machine tool base, vehicle chassis, agricultural equipment.
Industrial equipment: storage tanks, conveyor belt brackets, oil pipeline supports.
Others: pile foundations, templates, decorative parts, etc.

Production process and testing:
Process: continuous casting → hot rolling → cold rolling → annealing → finishing (straightening, flaw detection).
Testing methods: ultrasonic flaw detection, tensile test, etc.

Mechanical properties of ASTM A36:

Yield strength——≥250MPa
Tensile strength - 400MPa-550MPa
Elongation after break——≥20% (without impact)

Delivery status of ASTM A36:
There are no defects such as cracks, bubbles, and scars on the surface. The delivery status of the steel plate is hot-rolled, and it can be delivered according to technical requirements such as normalizing, tempering, and controlled rolling; flaw detection can be done as 1 probe, 2 probe, and 3 probe; Thickness extension can do z15, z25, z35. A36 steel is usually delivered in hot-rolled state, belongs to calm steel, and has stable mechanical properties.

Common specifications of ASTM-A36 steel plates: (thickness*width*length)

8mm*1800mm-10000mm
10mm*2000mm-11000mm
12mm*2200mm-12000mm
14mm*2500mm-12000mm
16mm*1800mm-2200mm*12000mm
18mm-30mm*1500mm-2500mm*2410mm-12000mm
31mm-50mm*1800mm-2800mm*1350mm-13000mm
51mm-80mm*1200mm-2800mm*1470mm-13000mm
85mm-120mm*1100mm-2800mm*1620mm-13500mm
125mm-180mm*1050mm-3000mm*2400mm-9600mm

Hunan Standard Steel Co., Ltd (HSCO) can produce wide and thick ASTM A36 steel plates with a thickness of up to 400mm, which can also be cut and processed according to drawings or fixed in small batches.

ASTM A36 This type of steel can be smelted by oxygen converter, open hearth furnace or electric furnace, and is generally hot rolled into steel plates, steel strips, profiles and bars.

Conclusion:
ASTM A36 is an economical and practical low-carbon structural steel. It has become a common material for construction and machinery manufacturing with good weldability, processability and moderate strength. However, it should be noted that its corrosion resistance is insufficient. Surface protection is required in humid or chemical environments.

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