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17-4PH
ISO M (stainless steel)Some makers: ISO P (steel)Tool makers differ on the ISO workpiece group: Sumitomo Electric (classifies precipitation-hardening stainless steels as M): M[3]; Sandvik Coromant: P (Classifies martensitic precipitation-hardening steels as P (MC code P5.0.Z.PH))[4]. Choose insert grades and data according to the maker of the tool you use.
Precipitation-hardening stainless steel (martensitic). Number: UNS S17400 (Type 630). Standard: Type 630 in ASTM A564/A564M (bar), ASTM A693 (sheet/plate) and ASTM A705/A705M (forgings); AMS 5643 (bar, forgings) and AMS 5604 (sheet/plate).
🌐JIS and international equivalents
“Close” means composition or properties are not exactly the same. Before substituting, check the values in each standard.
| System | Designation | Number | Relation | Confidence |
|---|---|---|---|---|
| UNS | 17-4PH | UNS S17400 (Type 630) | — | |
| JIS | SUS630 | JIS G 4303 (bar) and others | equivalent | Agrees in 2+ sources[9][10][11] |
| EN | X5CrNiCuNb16-4 | 1.4542 | close | Agrees in 2+ sources[9][10][7] |
| ISO | ISO 15510 number 4542-174-00-I | 4542-174-00-I | close | One source / reference[9] |
| GB | 05Cr17Ni4Cu4Nbformer designation 0Cr17Ni4Cu4Nb | S51740 | close | Agrees in 2+ sources[10][9] |
Differences between the equivalents (from the sources)
- JIS SUS630: In the Japan Stainless Steel Association comparison table SUS630 = S17400, and the Baosteel grade cross-reference also has S17400, 630 = SUS630. The JIS composition ranges of Nippon Steel and Sanyo are the same figures as ASTM Type 630 (C ≤0.07, Cr 15.00-17.50, Ni 3.00-5.00, Cu 3.00-5.00, Nb 0.15-0.45). Mechanical properties differ slightly: H900 yield strength is 1175 min in JIS and 1170 min in ASTM, and H900 hardness is HBW 375 min in JIS and HB 388 min in ASTM
- EN X5CrNiCuNb16-4: Corresponds to SUS630 / S17400 in the Japan Stainless Steel Association comparison table (per EN 10088) and the Baosteel cross-reference. Ugitech guarantees UGIMA 4542 to both EN 10088-3 and ASTM A564; the aged conditions in EN (+P1070, +P960, +P930, etc.) are named differently from the ASTM H designations
- GB 05Cr17Ni4Cu4Nb: The grade name comes from the Baosteel cross-reference (05Cr17Ni4Cu4Nb = S17400, 630 = SUS630 = 1.4542); the unified numerical code S51740 appears only in the Japan Stainless Steel Association comparison table. Composition values on the GB side are not confirmed
📄Related specifications (AMS, ASTM etc.)
Specifications called up on purchase orders and drawings. AMS are SAE aerospace material specifications, split by product form (bar, plate, forging), melting practice and heat treatment. Standard texts are paid, so only titles and scopes checked on the publishers’ public pages are shown.
| Spec | Scope | Confidence |
|---|---|---|
| AMS 5643 | Steel, Corrosion-Resistant, Bars, Wire, Forgings, Mechanical Tubing, and Rings 16Cr - 4.0Ni - 0.30Cb (Nb) - 4.0Cu Solution Heat Treated, Precipitation HardenableBar, wire, forgings, tubes for machine structural use and rings. Supplied solution treated; the user ages it | Agrees in 2+ sources[12][1] |
| AMS 5604 | Steel, Corrosion Resistant, Sheet, Strip, and Plate 16.5Cr - 4.0Ni - 4.0Cu - 0.30Cb Solution Heat Treated, Precipitation HardenableSheet, strip and plate. Supplied solution treated; aged to H900-H1150 | Agrees in 2+ sources[13][1] |
| ASTM A564/A564M | Standard Specification for Hot-Rolled and Cold-Finished Age-Hardening Stainless Steel Bars and ShapesHot-rolled and cold-finished bars and shapes. Type 630 can be supplied solution treated or aged | Agrees in 2+ sources[14] |
| ASTM A693 | Standard Specification for Precipitation-Hardening Stainless and Heat-Resisting Steel Plate, Sheet, and StripPlate, sheet and strip. Supplied solution treated | Agrees in 2+ sources[15] |
| ASTM A705/A705M | Standard Specification for Age-Hardening Stainless Steel ForgingsForgings | One source / reference[16] |
All ASTM standards on Kezuriba: ASTM standards quick reference.
✈Main aerospace uses (as stated in the sources)
- Carpenter lists aircraft and missile fittings as one of its applications[2]
- MIL-HDBK-5J: used for parts requiring high strength and corrosion and oxidation resistance up to 600°F (about 316°C), and states that all product forms are available. Because thick bars in H900 and H925 can have very low impact values at low temperature, it advises avoiding them for critical low-temperature applications and using 15-5PH instead[8]
⚗Chemical composition (mass %)
As specified in ASTM A564/A705 Type 630 (Carpenter: analysis range for material to AMS 5643, ASTM A564, etc. / Industeel: ASTM A705 grade 630)
| Element | Range | Confidence |
|---|---|---|
| C | ≤ 0.07 | Agrees in 2+ sources[2][5] |
| Si | ≤ 1 | Agrees in 2+ sources[2][5] |
| Mn | ≤ 1 | Agrees in 2+ sources[2][5] |
| P | ≤ 0.04 | Agrees in 2+ sources[2][5] |
| S | ≤ 0.03 | Agrees in 2+ sources[2][5] |
| Cr | 15.0 – 17.5 | Agrees in 2+ sources[2][5] |
| Ni | 3 – 5 | Agrees in 2+ sources[2][5] |
| Cu | 3 – 5 | Agrees in 2+ sources[2][5] |
| Nb+Ta | 0.15 – 0.45 | Agrees in 2+ sources[2][5] |
⚖Density
7.75 g/cm³
Value for the solution-treated condition (Condition A). ATI 7.75, Carpenter 7.75 (7750 kg/m³) and Ugitech (+AT) 7750 kg/m³ agree. Density increases after aging: H900 is ATI 7.81, Carpenter 7.80, MIL-HDBK-5J 0.282 lb/in³ (≈7.81); H1150 is ATI 7.86, Carpenter 7.82. Sanyo's physical properties table gives SUS630 as 7.78 (condition not stated)
Calculate weight in 17-4PH →💪Mechanical properties
“Reference” values are not specified minimums from the standard but figures published by makers and others.
| Condition | Tensile MPa | Yield MPa | Elong. % | Hardness | Type of value |
|---|---|---|---|---|---|
| Condition A (solution treated at 1950°F/1066°C) | 1030 | 760 | 8 | HRC 33 | Typical value (ATI datasheet; not a specified value) One source / reference[1] |
| Solution treated S (JIS G 4303 SUS630, 1020-1060°C, rapid cooling) | — | — | — | HBW 363 max / HRC 38 max | JIS specified value (from Sanyo Special Steel catalog, SUS630 bar) One source / reference[6] |
| H900 (ASTM A564 bar) | ≥ 1310 | ≥ 1170 | ≥ 10 | HRC 40 min / HB 388 min | ASTM A564 specified value (guaranteed-value table in Ugitech UGIMA 4542 datasheet) One source / reference[7] |
| H900 (AMS 5643 forgings, tubes and rings, thickness under 8 in, L direction) | ≥ 1310 (190 ksi) | ≥ 1172 (170 ksi) | ≥ 10 | — | AMS 5643 S-basis value = specified minimum (MIL-HDBK-5J Table 2.6.9.0(d)) One source / reference[8] |
| H900 (AMS 5604 sheet, strip and plate, thickness 4.000 in or less) | ≥ 1310 (190 ksi) | ≥ 1170 (170 ksi) | ≥ 5 (0.015–0.186 in) / >=8 (0.187–0.625 in) / >=10 (0.626–4.000 in) | HRC 40-47 (as stated by ATI) | AMS 5604 specified value (minimum-value table in ATI datasheet; agrees with the S-basis values in MIL-HDBK-5J Table 2.6.9.0(b)(c)) Agrees in 2+ sources[1][8] |
| H900 (JIS G 4303 SUS630, after S treatment, 470-490°C air cooled) | ≥ 1310 | ≥ 1175 | ≥ 10 | HBW 375 min / HRC 40 min | JIS specified value (from Sanyo Special Steel catalog, SUS630 bar) One source / reference[6] |
| H900 (typical value) | 1340 | 1240 | 10 | HRC 43 | Typical value (ATI datasheet) One source / reference[1] |
| H1025 (ASTM A564 bar) | ≥ 1070 | ≥ 1000 | ≥ 12 | HRC 35 min / HB 331 min | ASTM A564 specified value (guaranteed-value table in Ugitech UGIMA 4542 datasheet) One source / reference[7] |
| H1025 (AMS 5643 forgings, tubes and rings, L direction) | ≥ 1069 (155 ksi) | ≥ 1000 (145 ksi) | ≥ 12 | — | AMS 5643 S-basis value = specified minimum (MIL-HDBK-5J Table 2.6.9.0(d)) One source / reference[8] |
| H1025 (AMS 5604 sheet, strip and plate) | ≥ 1070 (155 ksi) | ≥ 1000 (145 ksi) | ≥ 5 (0.015–0.186 in) / >=8 (0.187–0.625 in) / >=12 (0.626–4.000 in) | HRC 35-42 (as stated by ATI) | AMS 5604 specified value (ATI datasheet; agrees with MIL-HDBK-5J S-basis values) Agrees in 2+ sources[1][8] |
| H1025 (JIS G 4303 SUS630, after S treatment, 540-560°C air cooled) | ≥ 1070 | ≥ 1000 | ≥ 12 | HBW 331 min / HRC 35 min | JIS specified value (from Sanyo Special Steel catalog) One source / reference[6] |
| H1150 (ASTM A564 bar) | ≥ 930 | ≥ 725 | ≥ 16 | HRC 28 min / HB 277 min | ASTM A564 specified value (guaranteed-value table in Ugitech UGIMA 4542 datasheet) One source / reference[7] |
| H1150 (AMS 5643 forgings, tubes and rings, L direction) | ≥ 931 (135 ksi) | ≥ 724 (105 ksi) | ≥ 16 | — | AMS 5643 S-basis value = specified minimum (MIL-HDBK-5J Table 2.6.9.0(d)) One source / reference[8] |
| H1150 (AMS 5604 sheet, strip and plate) | ≥ 930 (135 ksi) | ≥ 725 (105 ksi) | ≥ 8 (0.015–0.186 in) / >=10 (0.187–0.625 in) / >=16 (0.626–4.000 in) | HRC 28-37 (as stated by ATI) | AMS 5604 specified value (ATI datasheet; agrees with MIL-HDBK-5J S-basis values) Agrees in 2+ sources[1][8] |
| H1150 (JIS G 4303 SUS630, after S treatment, 610-630°C air cooled) | ≥ 930 | ≥ 725 | ≥ 16 | HBW 277 min / HRC 28 min | JIS specified value (from Sanyo Special Steel catalog) One source / reference[6] |
| H1150 (typical value) | 1000 | 860 | 10 | HRC 31 | Typical value (ATI datasheet) One source / reference[1] |
1 MPa ≈ 145 psi (0.145 ksi). Hardness conversion · unit converter
🔧Machinability notes (as stated in the sources)
- In the solution-treated condition (Condition A) it machines like Type 302 and 304, and machinability improves as the aging temperature rises. H1150M is the easiest to machine (Carpenter)[2]
- The same precautions as for austenitic grades apply, but work hardening is not a problem. H1150 and H1150M are the easiest to machine. On aging, H900 shrinks 0.0004-0.0006 in/in and H1150 shrinks 0.0008-0.0010 in/in, so allow for this when finish machining before aging (MIL-HDBK-5J)[8]
- Plasma cutting of material over about 1 in thick in the solution-treated condition can cause cracks, and bending or machining in the solution-treated condition makes such cracks more likely. Aging at 1150°F or above before cutting reduces the risk of cracking (ATI)[1]
- In Sumitomo Electric's recommended conditions for turning stainless steel (M), cutting speeds for precipitation-hardening grades (SUS630, SUS631, etc.) are 90-115-140 m/min for finishing, 70-90-130 continuous, 50-80-120 light interrupted, and 40-70-100 m/min interrupted (lower limit-recommended-upper limit). This is lower than for austenitic grades (finishing 120-180-240)[3]
📚Sources
Primary sources (public documents from makers, industry associations and standards bodies), numbered where each value is cited. Many are in Japanese.
- atimaterials.com https://www.atimaterials.com/Products/Documents/datasheets/stainless-specialty-steel/preci…
- carpentertechnology.com https://www.carpentertechnology.com/hubfs/7407324/Material%20Saftey%20Data%20Sheets/Custom…
- sumitool.com https://www.sumitool.com/downloads/cutting-tools/general-catalog/assets/pdf/a.pdf
- sandvik.coromant.com https://www.sandvik.coromant.com/en-us/knowledge/materials/workpiece-materials
- industeel.arcelormittal.com https://industeel.arcelormittal.com/fichier/ds-meca-17-4-ph
- sanyo-steel.co.jp https://www.sanyo-steel.co.jp/english/product/special_steel/images/pdf/stainless_201712.pd…
- swisssteel-group.com https://swisssteel-group.com/content-media/documents/_import/DAT-UGIMA-4542-fr.pdf
- everyspec.com https://everyspec.com/MIL-HDBK/MIL-HDBK-0001-0099/MIL_HDBK_5J_139/
- jssa.gr.jp https://www.jssa.gr.jp/contents/products/standards/comparisons/
- esales.baosteel.com http://esales.baosteel.com/bsi/ologin/pdf/cpscxz/cpscxz1601.pdf
- nipponsteel.com https://www.nipponsteel.com/product/catalog_download/__icsFiles/afieldfile/2025/10/06/S011…
- saemobilus.sae.org https://saemobilus.sae.org/standards/ams5643w-steel-corrosion-resistant-bars-wire-forgings…
- saemobilus.sae.org https://saemobilus.sae.org/standards/ams5604f-steel-corrosion-resistant-sheet-strip-plate-…
- astm.org https://astm.org/Standards/A564.htm
- store.astm.org https://store.astm.org/standards/a693
- astm.org https://www.astm.org/Standards/A705.htm
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