3X3M3F

Other

3X3M3F

Hot forging die steel. (GOST 1435; equiv GB 5CrNiMo / DIN 1.2713 / JIS SKT4). Nominal values—confirm mill certificate.

Chemical Composition (%)

C0.5
SI0.4
MN0.5
CR0.5
NI1.4
MO0.15

Mechanical Properties

Hardness (Q&T):35-45 HRC

Chinese Standard

GOST 1435 3X3M3F

Applications

热锻模钢。,Block

Available Forms

Low-alloy engineering steel with enhanced hardenability and strength from alloying elements. Chromium (≈0.65%) improves hardenability, wear and corrosion resistance. Molybdenum (≈0.225%) raises high-temperature strength and prevents temper embrittlement. Nickel (≈1.6%) increases toughness and impact strength at low temperature. Applied to gears, shafts, bolts, connecting rods, pressure parts and heavy forgings in automotive, energy and machinery sectors.

Uses

Austenitize at 760–820 °C and quench (oil/water) then temper at 150–400 °C for high hardness; spheroidize anneal (680–720 °C) improves machinability of the as-rolled bar.

Heat Treatment

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).

Precautions

GB 5CrNiMo / DIN 1.2713 / JIS SKT4

Request a Quote Back to category

Comments 0