9SiCr

Other

9SiCr

High-C high-Cr cold-work tool steel. (GB/T 1299; equiv GB Cr12 / DIN 1.2080 / JIS SKD1). Nominal values—confirm mill certificate.

Chemical Composition (%)

C0.85
SI1.2
MN0.3
CR0.95
P0.03
S0.03

Mechanical Properties

Hardness(annealed):241-197 HB;Hardness(hardened):≥62 HRC

Chinese Standard

T 1299 9SiCr

Equivalent Grades

GB Cr12 / DIN 1.2080 / JIS SKD1

Applications

高碳高铬冷作模具钢。,"Bar

Available Forms

Block"

Uses

Spring steel with high elastic limit and fatigue strength for coils, leaf springs, clips and suspension parts. Silicon (≈1.4%) raises elastic limit and tempering resistance. Supplied as strip, wire and bar; shot-peened after forming for longer service life.

Heat Treatment

Austenitize 830–880 °C (oil quench) and temper at 400–520 °C; stress-relieve formed springs at 230–320 °C after coiling.

Precautions

Preheat and control interpass temperature when welding; post-weld heat treatment or stress relief is recommended to avoid hard-zone cracking. Use low-hydrogen electrodes. Protect from decarburization during heating (controlled atmosphere or protective coating). Shot-peen after coiling to improve fatigue life; avoid sharp bends and surface defects.

Request a Quote Back to category

Comments 0