Z-140
Alloy SteelZ-140
Specialty steel grade. ; equiv Z-140). Nominal values—confirm mill certificate.
Chemical Composition (%)
| C | 0.38 |
|---|---|
| SI | 0.15 |
| MN | 0.75 |
| CR | 0.8 |
| MO | 0.15 |
Mechanical Properties
Tensile:≥1080 MPa;Yield:≥930 MPa;Elong:≥12%
Chinese Standard
API 7 Z-140
Equivalent Standards
Z-140
Applications
通用铬钼调质钢。,Bar
Available Forms
Low-alloy engineering steel with enhanced hardenability and strength from alloying elements. Chromium (≈0.95%) improves hardenability, wear and corrosion resistance. Molybdenum (≈0.2%) 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.
Uses
Austenitize at 820–870 °C (oil or water quench depending on section) and temper at 400–650 °C to the required strength/toughness balance.
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).
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