SCM440 is an alloy structural steel wire. The careful blending of its chemical composition gives SCM440 wire excellent heat resistance, wear resistance and corrosion resistance, and the tensile strength of more than 1080MPa enables it to withstand huge tension and pressure; SCM440 wire has little tendency to temper brittleness. After heat treatment, its performance is more stable and reliable, and it can still maintain excellent processing performance under high temperature environment, which makes it possible to realize complex processes.

Manufacturing specifications M18~M30 performance grade 12.9 hexagonal flange bolts, hexagonal head bolts, stud bolts and high-strength bolts with small head deformation, the application temperature range is -65°C~+400°C.

Chemical element content (%)

Specification：2.00~42.00mm

Application: Commonly used in the manufacture of crankshafts, camshafts, gears, bearings, shafts, pins, connecting rods, knives, molds, high-strength tools, etc.;
Widely used in automotive parts manufacturing, mechanical equipment, tool manufacturing and other fields.

Mechanical properties:

-Yield strength ≥930MPa, elongation ≥12%, cross-sectional shrinkage ≥45%, impact energy ≥63J, impact toughness ≥78 (8) J/cm², hardness ≤217HB; (specimen blank size is 25mm).

It should be noted that the mechanical properties of specimens with different diameters or thicknesses may vary.

Heat treatment specifications: 880℃ oil quenching for 1 hour, 650-680℃ tempering for 2 hours, air cooling.The metallographic structure is tempered martensite.