Printed from Kezuriba (kezuriba.net/en/materials/15-5ph/)
15-5PH
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). This grade is not named specifically: 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 S15500 (ASTM Type XM-12). Standard: XM-12 in ASTM A564/A564M (bar), ASTM A693 (sheet/plate) and ASTM A705 (forgings); AMS 5659 (bar, forgings) and AMS 5862 (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 | 15-5PH | UNS S15500 (ASTM Type XM-12) | — | |
| JIS | — | — | Not confirmed | |
| EN | X5CrNiCu15-5 | 1.4545 (aerospace WL 1.4545.4 / 1.4545.9) | close | One source / reference[7] |
| GB | — | — | Not confirmed |
Differences between the equivalents (from the sources)
- JIS : No equivalent JIS grade was found in primary sources (not in the Japan Stainless Steel Association comparison table, nor in the Sanyo or Nippon Steel catalogs)
- EN X5CrNiCu15-5: In Ugitech's aerospace literature, X5CrNiCu15-5 is given as the common designation for 15-5PH (UNS S15500), with WL 1.4545.4, WL 1.4545.9 and ASTM A564 listed in the standards column. The composition ranges have not been compared
- GB : The GB grade designation was not confirmed in primary sources (the Baosteel catalog also has no 15-5 type)
📄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 5659 | Steel, Corrosion Resistant, Bars, Wire, Forgings, Rings, and Extrusions 15Cr - 4.5Ni - 0.30Cb (Nb) - 3.5Cu Consumable Electrode Remelted Solution Heat Treated, Precipitation HardenableBar, wire, forgings, rings and extrusions. Consumable electrode remelted (MIL-HDBK-5J writes CEVM = consumable electrode vacuum melted), supplied solution treated | Agrees in 2+ sources[8][6] |
| AMS 5862 | Steel, Corrosion-Resistant, Sheet, Strip, and Plate, 15Cr - 4.5Ni - 0.30Cb (Nb) - 3.5Cu, Consumable Electrode Remelted, Solution Heat Treated, Precipitation-HardenableSheet, strip and plate. Consumable electrode remelted, supplied solution treated | Agrees in 2+ sources[9][6] |
| ASTM A564/A564M | Standard Specification for Hot-Rolled and Cold-Finished Age-Hardening Stainless Steel Bars and ShapesBars and shapes (XM-12). XM-12 is supplied in the solution-treated condition, among others | Agrees in 2+ sources[10] |
| ASTM A693 | Standard Specification for Precipitation-Hardening Stainless and Heat-Resisting Steel Plate, Sheet, and StripPlate, sheet and strip (XM-12). Supplied solution treated | Agrees in 2+ sources[11] |
All ASTM standards on Kezuriba: ASTM standards quick reference.
✈Main aerospace uses (as stated in the sources)
- Carpenter lists aircraft components, valve and engine parts, and fittings and fasteners as applications, and says it has been used where high transverse strength and toughness are required[2]
- MIL-HDBK-5J: used for corrosion-resistant, high-strength parts up to 600°F, with good transverse ductility and strength even in large sections. In its 17-4PH section it recommends 15-5PH (consumable electrode vacuum melted), which has high low-temperature impact values, for critical low-temperature applications[6]
⚗Chemical composition (mass %)
Ranges differ between specifications, so each one has its own column (dark figures agree in several sources, light figures come from one source).
| Element | Spec ① | Spec ② | Spec ③ |
|---|---|---|---|
| C | ≤ 0.07[5][2] | — | — |
| Si | ≤ 1[5][2] | — | — |
| Mn | ≤ 1[5][2] | — | — |
| P | ≤ 0.04[5][2] | — | — |
| S | — | ≤ 0.03[5] | ≤ 0.015[2] |
| Cr | 14.0 – 15.5[5][2] | — | — |
| Ni | 3.5 – 5.5[5][2] | — | — |
| Cu | 2.5 – 4.5[5][2] | — | — |
| Nb+Ta | 0.15 – 0.45[5][2] | — | — |
- Spec ① XM-12 / AMS (composition range from ATI product page and analysis range from Carpenter datasheet; both list ASTM A564, A693 and AMS 5659, 5862 as applicable specifications)
- Spec ② Range from ATI product page (values for a product listing both ASTM and AMS; which standard sets the limit is not stated)
- Spec ③ Analysis range from Carpenter datasheet (material to AMS 5658, 5659, 5862 and ASTM A564, A705, A693; which standard sets the limit is not stated)
⚖Density
7.75 g/cm³
Value for the solution-treated condition (Condition A). ATI 7.75 and Carpenter 7750 kg/m³ agree. After aging: Carpenter H900 7.80, H1150 7.82; ATI H900 7.81, H1150 7.86. MIL-HDBK-5J does not distinguish conditions and gives 0.283 lb/in³ (≈7.83). The ATI 15-5 physical properties table has exactly the same figures as the ATI 17-4 table
Calculate weight in 15-5PH →💪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 1900°F/1038°C) | 1030 | 760 | 8 | HRC 33 | Typical value (ATI datasheet) One source / reference[1] |
| H900 (AMS 5659 bar, diameter or thickness 12 in or less) | ≥ 1310 (190 ksi, both L and T) | ≥ 1172 (170 ksi, both L and T) | ≥ 10 (L) / >=6 (T) | — | AMS 5659 S-basis value = specified minimum (MIL-HDBK-5J Table 2.6.7.0(b)) One source / reference[6] |
| H900 (AMS 5862 sheet, strip and plate) | ≥ 1310 (190 ksi) | ≥ 1170 (170 ksi) | — | HRC 40–47 | AMS 5862 specified value (minimum-value table in ATI datasheet) One source / reference[1] |
| H900 (typical value) | 1340 | 1200 | 15 | HRC 43 | Typical value (ATI datasheet) One source / reference[1] |
| H1025 (AMS 5659 bar, 12 in or less) | ≥ 1069 (155 ksi, both L and T) | ≥ 1000 (145 ksi, both L and T) | ≥ 12 (L) / >=8 (T) | — | AMS 5659 S-basis value = specified minimum (MIL-HDBK-5J Table 2.6.7.0(b)) One source / reference[6] |
| H1025 (AMS 5862 sheet, strip and plate) | ≥ 1070 (155 ksi) | ≥ 1000 (145 ksi) | — | HRC 35–42 | AMS 5862 specified value (minimum-value table in ATI datasheet) One source / reference[1] |
| H1150 (AMS 5659 bar, 12 in or less) | ≥ 931 (135 ksi, both L and T) | ≥ 724 (105 ksi, both L and T) | ≥ 16 (L) / >=11 (T) | — | AMS 5659 S-basis value = specified minimum (MIL-HDBK-5J Table 2.6.7.0(b)) One source / reference[6] |
| H1150 (AMS 5862 sheet, strip and plate) | ≥ 930 (135 ksi) | ≥ 725 (105 ksi) | — | HRC 28–37 | AMS 5862 specified value (minimum-value table in ATI datasheet) One source / reference[1] |
| H1150 (typical value) | 1000 | 860 | 15 | 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 it can be machined at about the same speed as Type 304; for H900, 60% of that speed is suitable. The highest machining speeds are possible with H1150 and H1150M (MIL-HDBK-5J)[6]
- In the solution-treated condition it machines like Type 302 and 304, and machinability improves as the aging temperature rises. H1150M is the easiest to machine. If high strength is needed after machining in H1150M, re-solution treat and then give the standard aging treatment (Carpenter)[2]
- To get the softest condition for machinability and formability, the two-step treatment in ASTM A693 can be used (1400°F x 2 h air cool + 1150°F x 4 h air cool) (ATI)[1]
- On aging, H900 shrinks 0.0004-0.0006 in/in and H1150 shrinks 0.0008-0.0010 in/in (MIL-HDBK-5J)[6]
📚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://carpentertechnology.com/hubfs/20231212--CT_15Cr-5Ni_Datasheet_F.pdf
- 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
- atimaterials.com https://www.atimaterials.com/Products/ati-15-5
- everyspec.com https://everyspec.com/MIL-HDBK/MIL-HDBK-0001-0099/MIL_HDBK_5J_139/
- swisssteel-group.com https://swisssteel-group.com/content-media/documents/Brochures/Ugitech-Applications/Stainl…
- saemobilus.sae.org https://saemobilus.sae.org/standards/ams5659t-steel-corrosion-resistant-bars-wire-forgings…
- sae.org https://www.sae.org/standards/content/ams5862k/
- astm.org https://astm.org/Standards/A564.htm
- store.astm.org https://store.astm.org/standards/a693
Other materials
Aerospace steel