EN 1.4542 / 17-4 PH
MATERIAL DESCRIPTION
17-4 PH is a martensitic precipitation hardening stainless steel with additions of copper (Cu), niobium (Nb) and tantalum (Ta). The grade combines high strength and hardness values with moderate corrosion resistance. Different heat treatment temperatures can optimize mechanical properties, e.g. yield strength at 1100 – 1300MPa. Our stock material is double aged at 620°C (1150°F) – defined as H1150D.
Applications
17-4 PH provides an outstanding combination of high strength, good mechanical properties, good corrosion resistance, outstanding wear resistance and good toughness at temperatures up to 310°C. 17-4 PH is used in chemical, petrochemical, paper and general metalworking industries. Only approved by NACE for restricted components and environments.
Heat Treatment
Solution annealed at 1040°C. Double hardened/ aged at 620°C (1150°F).
Weldability
Good, Pre-heating and post-heating practices used for standard hardenable stainless grades are not required.
Chemical Composition (Specific for Bars)
| Weight % | C | Mn | P | S | Si | Cr | Ni | Mo | Cu | Nb+Ta |
| Min. | 15,0 | 3,50 | 3,00 | 0,15 | ||||||
| Max. | 0,070 | 1,00 | 0,040 | 0,030 | 0,70 | 17,5 | 5,00 | 0,60 | 5,00 | 0,45 |
Reference standards
General:
- PED 2014/68/EU Annex I section 4.3
-
AD2000 W0
-
NACE MR0175/ ISO 15156-3 and NACE MR0103/ ISO 17945
Bars:
- ASTM A564, EN10088-3
Mechanical Properties (Specific for Bars – Condition H1150D)
| Condition | Yield strength Rp0.2, MPa |
Tensile strength Rm, MPa |
Elongation [%] |
Hardness [HB] |
Impact, Charpy-V, -6ºC [J] |
Impact, Charpy-V, -46ºC [J] |
| H1150D | ≥ 725 | ≥ 860 | ≥ 16 | ≤ 311 | ≥ 60 | ≥ 27 |
Round Bar Stock
| DIA | KG/M |
| 25,4 mm | 4.2 |
| 31,75 mm | 6.2 |
| 38,1 mm | 9.2 |
| 45 mm | 12.7 |
| 50,8 mm | 16.2 |
| 63,5 mm | 25. |
| 76,2 mm | 36.8 |
| 91 mm | 52.2 |
| 101,6 mm | 64.7 |
| 120,65 mm | 91.7 |
| 127 mm | 100. |
| 152 mm | 147 |
| 177,8 mm | 200 |
| 203,4 mm | 261 |
| 216 mm | 294 |
| 228,6 mm | 330 |
| 254 mm | 402 |
| 305 mm | 580 |
| 355,6 mm | 797 |
Equivalent standards
- EN 1.4542
- UNS S17400
- AISI 630
- 17-4 PH