The tempering process for API 5L line pipes involves different temperature ranges based on specific performance requirements. The tempering types are categorized according to their tempering temperatures, each serving a distinct purpose:
Low Temperature Tempering (150-250°C):
Structure: Tempered martensite.
Purpose: Reduce internal stress and brittleness of quenched steel while maintaining high hardness and wear resistance. This prevents cracking or premature damage during use.
Applications: High-carbon cutting tools, measuring tools, rolling bearings, and carburized parts.
Hardness After Tempering: Generally HRC58-64.
Medium Temperature Tempering (250-500°C):
Structure: Tempered troostite.
Purpose: Attain high yield strength, elastic limit, and toughness.
Applications: Treatment of various hot work molds.
Hardness After Tempering: Generally HRC35-50.
High Temperature Tempering (500-650°C):
Structure: Tempered sorbite.
Purpose: Obtain comprehensive mechanical properties with good strength, hardness, plasticity, and toughness. Commonly referred to as quenching and tempering treatment when combined with quenching.
Applications: Used widely in vital structural parts of automobiles and machine tools, including connecting rods, bolts, gears, and shafts.
Hardness After Tempering: Generally HB200-330.
Nantong Zhencheng Steel Co., Ltd., a professional API 5L carbon steel tube supplier, is an integrated entity that manages warehousing, sales, processing, and distribution. Specializing in various seamless steel pipes, the company provides on-demand solutions for special processes, sizes, and materials. Their custom-made products find applications in diverse industrial fields such as engineering, coal mines, textiles, electric power, boilers, machinery, and military industries.
