13CrMo4-5
1.7335Low-alloy Cr-Mo steel for elevated-temperature service. Good creep resistance up to 500°C. The standard grade for boiler tubes, headers, superheater tubes, and pressure equipment in power generation. Lower alloy content than 10CrMo9-10.
International equivalents
| Flag | Standard | Country | Grade | Number | Match |
|---|---|---|---|---|---|
| 🇺🇸 | ASTM | USA | ASTM A387 Gr 12 | K11562 | REF |
| 🇪🇺 | EN | Europe | 13CrMo4-5 | 1.7335 | 100% |
| 🇪🇺 | DIN | Europe | 13CrMo44 (old) | — | 98% |
| 🇺🇸 | ASTM | USA | ASTM A335 P12 | K11562 | 90% |
Sources: ASTM A387, EN 10028-2, DIN 17175, ASTM A335
Chemical composition comparison (wt%)
Side-by-side: 13CrMo4-5 (EN) (EN 10028-2) vs 13CrMo44 (old) (DIN)
| Element | 13CrMo4-5 (EN) | 13CrMo44 (old) (DIN) | Overlap |
|---|---|---|---|
| C | 0.1–0.17% | — | — |
| Si | 0–0.35% | — | — |
| Mn | 0.4–1% | — | — |
| P | 0–0.025% | — | — |
| S | 0–0.01% | — | — |
| Cr | 0.7–1.15% | — | — |
| Mo | 0.4–0.6% | — | — |
Mechanical properties
Normalized Tempered
| Property | Value | Unit |
|---|---|---|
| Tensile Strength | 440–590 | MPa |
| Yield Strength | ≥ 290 | MPa |
| Elongation | ≥ 20 | % |
| Elastic Modulus | ≥ 210 | GPa |
| Density | ≥ 7.85 | g/cm3 |
Heat treatment
| Process | Temperature | Medium | Holding Time | Notes |
|---|---|---|---|---|
| normalizing | 900–940 °C | air | min 2 min per mm | — |
| tempering | 650–720 °C | air | min 30 min | Always temper after normalizing |
| stress_relief | 620–660 °C | furnace | 1 hour per 25mm | PWHT after welding — mandatory |
Compatibility verdict
13CrMo4-5 and 13CrMo44 (old): 98% composition match
Close equivalents but NOT identical.
Related materials
50CrV4
1.8160Chromium-vanadium spring/tool steel — identical alloy system to 51CrV4 (1.8159) but recognized as a separate grade in some standards. Dual use: heavy-duty springs (EN 10089) AND cold work tools (knives, shear blades). V improves temper resistance and grain refinement. UTS 1200-1500 QT. Used for heavy leaf springs, stabilizer bars, torsion bars, and cold work cutting tools.
51CrMoV4
1.7701CrMoV alloyed spring steel — THE European automotive suspension spring material. CrMo gives deep hardenability for large coil springs, V adds grain refinement and secondary hardening for fatigue resistance. UTS 1350-1600 MPa QT. Used for hot-formed coil springs (cars, trucks), leaf springs, torsion bars, and stabilizer bars. Excellent sag resistance to 200°C.
20MnCr5
1.7147Manganese-chromium case-hardening steel with higher core strength than 16MnCr5. Used for heavily loaded gears, shafts, camshafts, and transmission components requiring high surface hardness with tough core. Popular in automotive and heavy machinery.
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