Comprehensively Excellent Jis Scr440 Sheet Tempering Stability - China

JIS SCr440 sheet is a chromium-molybdenum alloy structural steel in the Japanese Industrial Standard (JIS).

It corresponds to 42CrMo steel in the Chinese GB/T 3077 standard and 42CrMo4 steel in the German DIN standard.

Its core characteristics are high strength, high toughness, and good hardenability.

Tempering stability is a key indicator of its performance stability after heat treatment, directly affecting its ability to maintain performance during high-temperature service or long-term use.

Tempering stability, also known as resistance to tempering softening, refers to the ability of JIS SCr440 sheet to resist hardness loss and strength loss during tempering after quenching.

- Steels with high tempering stability: At the same tempering temperature, they experience less hardness/strength loss; higher tempering temperatures may be required to achieve the same softening effect, and they retain a better balance of strength and toughness after tempering.

- Steels with low tempering stability: They soften significantly even after tempering at low temperatures, making it difficult to maintain high strength at higher temperatures.

Summary: JIS SCr440 sheet, thanks to the synergistic effect of the Cr-Mo alloy, exhibits excellent tempering stability—resistance to low-temperature softening, stable high-temperature performance, and low brittleness sensitivity.

This makes it an ideal alternative to ordinary carbon steel and single-chromium steel in medium- and high-strength applications.

In practical applications, fully utilizing its tempering stability advantages requires controlling quenching quality (ensuring hardenability), optimizing the tempering process (temperature and time), and eliminating defects in the original structure, thereby ensuring the performance reliability and long service life of the final product.

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