The effect of nitrogen on steel performance is similar to that of carbon and phosphorus. With the increase of ASTM A210 Grade C seamless tube nitrogen content, the strength of steel can be improved, plasticity especially toughness can be significantly red
The effect of nitrogen on steel performance is similar to that of carbon and phosphorus. With the increase of ASTM A210 Grade C seamless tube nitrogen content, the strength of steel can be improved, plasticity especially toughness can be significantly reduced, weldability becomes worse, and cold brittleness is intensified. Nitrogen with aluminum, niobium, vanadium and other elements can reduce its adverse effects, improve the performance of ASTM A210 Grade C seamless tube steel, can be used as an alloying element of low alloy steel.
ASTM A210 Grade C seamless tube and Q690CF plate are hot rolled steel plates. The chemical composition of Q690CF steel is as follows: C: 0.05-0.08%, Si: 0.22-0.30%, Mn: 1.6-2.0%, Al: 0.2-0.35%, Cr: 0.10-0.35%, Mo: 0.20-0.35%, Ni: 0.1-0.4%, Cu: 0.15-0.3%, Nb: 0.025-0.045%, V: 0.01-0.03%, Ti: 0.005-0.03%, P ≤ 0.010%, S ≤ 0.008% by mass percentage, the remaining is Fe and unavoidable impurities.
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Special-shaped seamless pipe is the general term of seamless pipe with other cross-section shapes except circular pipe. According to the different shapes and sizes of steel pipe sections, it can be divided into equal wall thickness special-shaped seamless pipe (code D), unequal wall thickness special-shaped seamless pipe (code BD), variable diameter special-shaped seamless pipe (code BJ). ASTM A210 Grade C seamless tube. Special seamless pipe is widely used in all kinds of structural parts, tools and mechanical parts. Compared with the round pipe, the special-shaped pipe has larger inertia moment and section modulus, larger bending and torsion resistance, which can greatly reduce the structure weight and save steel.
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