What is the notice of preheating before SA573 Grade 70 structural carbon steel angle bar cutting

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Compared with 15Cr steel, 20Cr alloy has higher strength and hardenability. The critical hardening diameter in oil is 4-22mm, and the critical hardening diameter in water is 11-40mm, but the toughness is poor. This SA573 Grade 70 structural carbon steel angle bar alloy steel SA573 Grade 70 structural carbon steel angle bar still has a tendency to grow grains during carburization, and direct quenching at lower temperature has a greater impact on impact toughness, so secondary quenching is required after carburization to improve the toughness of the core of the part, and there is no temper brittleness.

Advantages of SA573 Grade 70 structural carbon steel angle bar:
1. Steel purity: Wugang can produce high purity molten steel with P 0.010%, S 0.005%, N70ppm, O15ppm, H2ppm, and 20ppm total inclusions in the steel.
2. Good toughness and weldability.
3. The heat treatment technology: normalizing, quenching, tempering, tempering and other heat treatment processing can be carried out on the steel plate as required.
4. Significantly improve the plasticity and impact toughness of steel, and improve the anisotropy of steel.

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