Chemical composition
Nominal: mid-range where both limits are given, the cap where only a maximum is, balance takes the remainder. Exact specified ranges below.
| Element | Name | Content % | |
|---|---|---|---|
| Main elements5 elements | |||
| Fe | Iron | Bal. | |
| Cr | Chromium | 15 – 17.5% | |
| Ni | Nickel | 3 – 5% | |
| Cu | Copper | 3 – 5% | |
| Nb | Niobium | 0.15 – 0.45% | |
| Element | Name | Content % | |
|---|---|---|---|
| Minor & residual5 elements | |||
| C | Carbon | ≤ 0.07% | |
| Mn | Manganese | ≤ 1% | |
| Si | Silicon | ≤ 1% | |
| P | Phosphorus | ≤ 0.04% | |
| S | Sulphur | ≤ 0.03% | |
Mechanical minima by form
Guaranteed values differ by form, size and delivery condition; quotations confirm the specification, form, size and condition.
| Form | Condition | Rm MPa | Rp0.2 MPa | A ≥ % | Other requirements and notes |
|---|---|---|---|---|---|
| Bar and forgings | |||||
| Bar and shapes | H900 (solution treated, aged at 480 °C for 1 h, air cooled; ≤75 mm, longitudinal) | ≥ 1310 (190 ksi) | ≥ 1170 (170 ksi) | ≥ 10 | |
| Bar and shapes | H925 (solution treated, aged at 495 °C for 4 h, air cooled; ≤75 mm, longitudinal) | ≥ 1170 (170 ksi) | ≥ 1070 (155 ksi) | ≥ 10 | |
| Bar and shapes | H1025 (solution treated, aged at 550 °C for 4 h, air cooled; ≤200 mm, longitudinal) | ≥ 1070 (155 ksi) | ≥ 1000 (145 ksi) | ≥ 12 | |
| Bar and shapes | H1150 (solution treated, aged at 620 °C for 4 h, air cooled; ≤300 mm, longitudinal) | ≥ 930 (135 ksi) | ≥ 725 (105 ksi) | ≥ 16 | |
| Bar and shapes | H1150M (760 °C for 2 h, air cooled, then 620 °C for 4 h, air cooled; ≤300 mm, longitudinal) | ≥ 795 (115 ksi) | ≥ 520 (75 ksi) | ≥ 18 | |
| Bar and shapes | Condition A, solution treated | — | — | — | |
| Bars (EN 10088-3, ≤100 mm) | +P1070 (precipitation hardened) | 1070 – 1270 | ≥ 1000 | ≥ 10 | Delivery condition +AT: Rm ≤ 1200 MPa, hardness ≤ 360 HBW. |
| Bars (EN 10088-3, ≤100 mm) | +P930 (precipitation hardened) | 930 – 1100 | ≥ 720 | ≥ 16 | KV ≥ 40 J longitudinal. |
| Bars (EN 10088-3, ≤100 mm) | +P800 (precipitation hardened) | 800 – 950 | ≥ 520 | ≥ 18 | KV ≥ 75 J longitudinal. |
| Plate, sheet and strip | |||||
| Hot-rolled plate (EN 10088-2, ≤50 mm) | +P1070 (precipitation hardened) | 1070 – 1270 | ≥ 1000 | ≥ 10 | Under 3 mm: A ≥ 8 %. |
| Hot-rolled plate (EN 10088-2, ≤50 mm) | +P950 (precipitation hardened) | 950 – 1150 | ≥ 800 | ≥ 12 | Under 3 mm: A ≥ 10 %. |
| Hot-rolled plate (EN 10088-2, ≤50 mm) | +P850 (precipitation hardened) | 850 – 1050 | ≥ 600 | ≥ 14 | Under 3 mm: A ≥ 12 %. |
Where this grade is recommended
Matched in 1 service conditions; ranks and scores computed from the condition-scoring matrix.
| Service condition | Industry | Temperature | Rank | Score |
|---|---|---|---|---|
| Surgical instruments | Medical Devices | High-temperature processing | 1 / 5 | 87 |
Designations & equivalents
| W.Nr. (Germany) | 1.4542 |
| EN designation | X5CrNiCuNb16-4 |
| Trade name(s) | 17-4PH / Type 630 |
| ASTM / AISI | A564 / A693 / A705 / A982 / A1028 (Type 630) |
| AMS (SAE aerospace) | 5604 / 5622 / 5643 |
| JIS (Japan) | SUS630 |
Cross-references are common near-equivalents for search and shortlisting; substitution across standards requires clause-by-clause verification. All grades in one cross-reference table →
Applicable standards
10 specifications. Name the standard and its edition on the order.
Guaranteed values and required tests differ between specifications — see Mechanical minima by form for the figures per form.
Frequently asked questions
What is 17-4PH Stainless · UNS S17400?
17-4PH Stainless · UNS S17400 — PH stainless steel. The most widely used PH stainless — pump and valve shafts, fasteners, nuclear internals
What is the maximum service temperature of S17400?
Typically about 315 °C; the practical limit depends on media, stress and design life — acceptance per the governing standard.
What is the tensile strength of S17400?
The specified minimum tensile strength is 1310 MPa for the main product form. Minima for other forms and sizes are listed under "Mechanical minima by form" on this page.
Which standards cover S17400?
ASTM A564/A564M, ASTM A693, ASTM A705/A705M, ASTM A982/A982M, ASTM A1028/A1028M, AMS 5604, AMS 5622, AMS 5643, EN 10088-2 (sheet, plate, strip), EN 10088-3 (bar, rod, wire, sections)
Where is S17400 typically used?
Surgical instruments (Medical Devices)
In which forms is S17400 available?
Tube, plate, strip, bar, forgings, wire and other forms — sizes and delivery condition confirmed per order, with EN 10204 3.1 / 3.2 certification.
Same series
Download PDF datasheet
This grade’s datasheet as an A4 PDF — for filing, printing or forwarding to colleagues.
Download PDF datasheetSupply & enquiry
Tube & pipeφ1 – 219 × 0.25 – 25 mm
Plate4.76 – 80 mm
Barφ8 – 300 mm
Wire & filler metalsφ0.01 – 8 mmFor this grade we can supply, against your service conditions:
- Tube, plate, strip, bar, forgings, wire and more — with size range and lead time
- Chemistry and mechanical test report (EN 10204 3.1 / 3.2)
- Like-for-like alternatives and selection advice
- Applicable standards and inspection scope
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