H11
OtherH11
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 | 0.32 |
|---|---|
| CR | 4.75 |
| MO | 1.1 |
| V | 0.3 |
| SI | 0.8 |
| MN | 0.2 |
| P | 0.03 |
| S | 0.03 |
Mechanical Properties
Hardness(annealed):≤229 HB;Hardness(hardened):48-55 HRC
Chinese Standard
T 5301 H11
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. Chromium (≈5.125%) improves hardenability, wear and corrosion resistance. Molybdenum (≈1.425%) raises high-temperature strength and prevents temper embrittlement. Vanadium (≈0.45%) refines grain and strengthens the tempered structure. 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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