S2

Other

Hot-work tool steel. (YB/T 5301; equiv ASTM A681 / DIN 1.2344 / JIS SKD61 / GB 4Cr5MoSiV1). Nominal values—confirm mill certificate.

Chemical Composition (%)

C	0.4
SI	0.9
MO	0.3
MN	0.3
P	0.03
S	0.03

Mechanical Properties

Hardness(annealed):≤217 HB;Hardness(hardened):56-61 HRC

Chinese Standard

T 5301 S2

Equivalent Standards

ASTM A681

Equivalent Grades

DIN 1.2344 / JIS SKD61 / GB 4Cr5MoSiV1

Applications

热作模具钢。,"Bar

Available Forms

Block"

Uses

Low-alloy engineering steel with enhanced hardenability and strength from alloying elements. Molybdenum (≈0.45%) raises high-temperature strength and prevents temper embrittlement. Applied to gears, shafts, bolts, connecting rods, pressure parts and heavy forgings in automotive, energy and machinery sectors.

Heat Treatment

Austenitize at 820–870 °C (oil or water quench depending on section) and temper at 400–650 °C to the required strength/toughness balance.

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).

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S2