SKT4

Other

SKT4

Hot forging die steel. (JIS G4404; equiv GB 5CrNiMo / DIN 1.2713 / JIS SKT4). Nominal values—confirm mill certificate.

Chemical Composition (%)

C0.5
SI0.35
MN0.6
CR0.7
NI1.5
MO0.3
P0.03
S0.03

Mechanical Properties

Hardness(annealed):≤241 HB;Hardness(hardened):40-47 HRC

Chinese Standard

JIS G4404 SKT4

Applications

热锻模钢。,Block

Available Forms

Low-alloy engineering steel with enhanced hardenability and strength from alloying elements. Chromium (≈0.85%) improves hardenability, wear and corrosion resistance. Molybdenum (≈0.4%) raises high-temperature strength and prevents temper embrittlement. Nickel (≈1.65%) 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

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