Printed from Kezuriba (kezuriba.net/en/materials/13-8mo/)
PH13-8Mo
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 S13800 (ASTM Type XM-13). Standard: XM-13 in AMS 5629 (bar, forgings, rings, extrusions), AMS 5864 (plate), ASTM A564 (bar), A693 (sheet/plate) and A705 (forgings).
🌐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 | PH13-8Mo | UNS S13800 (ASTM Type XM-13) | — | |
| JIS | — | — | Not confirmed | |
| EN | X3CrNiMoAl13-8-2 | 1.4534 | close | Agrees in 2+ sources[8][9] |
| GB | — | — | Not confirmed |
Differences between the equivalents (from the sources)
- JIS : No equivalent JIS grade was found in primary sources
- EN X3CrNiMoAl13-8-2: In the Aubert & Duval datasheet, X3CrNiMoAl13-8-2 = WL 1.4534 = UNS S13800 = AMS 5629. The title of the BSI aerospace (EN) series page also reads "Steel X3CrNiMoAl13-8-2 (1.4534) - Vacuum induction melted and consumable electrode remelted". The composition ranges have not been compared
- GB : The GB grade designation was not confirmed in primary sources
📄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 5629 | Steel, Corrosion-Resistant, Bars, Wire, Forgings, Rings, and Extrusions 13Cr - 8.0Ni - 2.2Mo - 1.1Al Vacuum Induction Plus Consumable Electrode Melted Solution Heat Treated, Precipitation HardenableBar, wire, forgings, rings and extrusions. Vacuum induction melted plus consumable electrode remelted (ATI: VIM + VAR; Carpenter also VIM-VAR), supplied solution treated | Agrees in 2+ sources[10][5] |
| AMS 5864 | Steel, Corrosion-Resistant, Plate, 13Cr - 8.0Ni - 2.2Mo - 1.1Al, Vacuum Induction Plus Consumable Electrode Melted, Solution Heat Treated, Precipitation HardenablePlate. Vacuum induction melted plus consumable electrode remelted (ATI plate: VIM + ESR), supplied solution treated | Agrees in 2+ sources[11][1] |
| ASTM A564/A564M | Standard Specification for Hot-Rolled and Cold-Finished Age-Hardening Stainless Steel Bars and ShapesBars and shapes (XM-13) | Agrees in 2+ sources[12] |
| ASTM A693 | Standard Specification for Precipitation-Hardening Stainless and Heat-Resisting Steel Plate, Sheet, and StripPlate, sheet and strip (XM-13). Supplied solution treated | Agrees in 2+ sources[13] |
All ASTM standards on Kezuriba: ASTM standards quick reference.
✈Main aerospace uses (as stated in the sources)
- ATI (bar) lists aircraft parts, rocket engine mounts, landing gear components and high-performance shafts as typical applications[5]
- ATI (plate) lists large airframe structural components as a typical application[1]
- Carpenter lists jet engine parts, aircraft and nuclear reactor parts, and fasteners as applications[2]
- Aubert & Duval lists aircraft structural parts, missile parts and bolting[8]
- MIL-HDBK-5J: used for parts requiring corrosion resistance, high strength, high fracture toughness and oxidation resistance up to 800°F; good transverse mechanical properties are cited as a major advantage[7]
⚗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 | Spec ④ |
|---|---|---|---|---|
| C | ≤ 0.05[5][1] | — | — | — |
| Si | — | ≤ 0.1[5][1] | — | — |
| Mn | — | — | ≤ 0.1[5] | ≤ 0.2[1][6] |
| P | — | ≤ 0.01[5][1] | — | — |
| S | — | ≤ 0.008[5][1] | — | — |
| Cr | — | 12.25 – 13.25[5][1] | — | — |
| Ni | — | 7.5 – 8.5[5][1] | — | — |
| Mo | — | 2.0 – 2.5[5][1] | — | — |
| Al | — | 0.90 – 1.35[5][1] | — | — |
| N | — | — | ≤ 0.01[5] | — |
- Spec ① ATI composition range (same for bar to AMS 5629 and plate to AMS 5864 / ASTM A564/A693/A705)
- Spec ② ATI (same for bar and plate). Carpenter's nominal 12.60 and Aubert & Duval's nominal 12.50 fall within this range
- Spec ③ ATI bar datasheet (AMS 5629 product). The plate datasheet has no N entry
- Spec ④ ATI plate datasheet and product page (AMS 5864 / ASTM A564, A693, A705 product)
⚖Density
7.76 g/cm³
ATI 7.76 (0.279 lb/in³), Carpenter 7.76 (H1000) and MIL-HDBK-5J 0.279 lb/in³ agree. Aubert & Duval gives a rounded "7,8"
Calculate weight in PH13-8Mo →💪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 |
|---|---|---|---|---|---|
| Solution treated (Condition A: about 1700°F/927°C, air or oil cooled to 60°F or below) | — | — | — | HBW 363 max (Carpenter) / about HRC 33 (ATI typical value) | Carpenter hardness table (no standard named) and ATI typical value One source / reference[2][1] |
| H950 (AMS 5629 bar, example of 0.625 in diameter, L/T) | ≥ 1515 (220 ksi) | ≥ 1415 (205 ksi) | ≥ 10 (L, T) | HBW 430 min | AMS 5629 specified value (excerpt from Carpenter datasheet) One source / reference[2] |
| H950 (AMS 5864 plate) | ≥ 1517 (220 ksi) | ≥ 1413 (205 ksi) | ≥ 10 | — | AMS 5864 specified value (minimum-value table in ATI plate datasheet) One source / reference[1] |
| H1000 (AMS 5629 bar, L/T) | ≥ 1415 (205 ksi) | ≥ 1310 (190 ksi) | ≥ 10 (L, T) | HBW 400 min | AMS 5629 specified value (excerpt from Carpenter datasheet) One source / reference[2] |
| H1000 (AMS 5864 plate) | ≥ 1413 (205 ksi) | ≥ 1310 (190 ksi) | ≥ 10 | HRC 43 min (ATI product page) | AMS 5864 specified value (minimum-value table in ATI plate datasheet) One source / reference[1][6] |
| H1025 (AMS 5629 bar, 12 in or less, L/T) | ≥ 1275 (185 ksi) | ≥ 1205 (175 ksi) | ≥ 11 (L, T) | — | AMS 5629 specified value (Carpenter excerpt and MIL-HDBK-5J Table 2.6.6.0(b) S-basis values agree) Agrees in 2+ sources[2][7] |
| H1050 (AMS 5629 bar, 12 in or less, L/T) | ≥ 1205 (175 ksi) | ≥ 1140 (165 ksi) | ≥ 12 (L, T) | HBW 372 min (Carpenter) | AMS 5629 specified value (Carpenter excerpt and MIL-HDBK-5J S-basis values agree) Agrees in 2+ sources[2][7] |
| H1100 (AMS 5629 bar, 12 in or less, L/T) | ≥ 1035 (150 ksi) | ≥ 931 (135 ksi) | ≥ 14 (L, T) | HBW 313 min (Carpenter) | AMS 5629 specified value (Carpenter excerpt and MIL-HDBK-5J S-basis values agree) Agrees in 2+ sources[2][7] |
| H1150 (AMS 5629 bar, 12 in or less, L/T) | ≥ 931 (135 ksi) | ≥ 620 (90 ksi) | ≥ 14 (L, T) | HBW 283 min (Carpenter) | AMS 5629 specified value (Carpenter excerpt and MIL-HDBK-5J S-basis values agree) Agrees in 2+ sources[2][7] |
| Hardness in aged condition (typical value) | — | — | — | H950 HRC 47 / H1000 45 / H1050 43 / H1100 35 / H1150 33 | Typical value (same figures in ATI bar and plate datasheets) One source / reference[5][1] |
1 MPa ≈ 145 psi (0.145 ksi). Hardness conversion · unit converter
🔧Machinability notes (as stated in the sources)
- Can be machined in either the solution-treated or aged condition. In the solution-treated condition, use speeds 20-30% lower than for Type 304 (ATI)[1][5]
- Can be machined in any heat-treated condition, but the easiest to machine is the overaged H1150M (1400°F x 2 h air cool + 1150°F x 4 h air cool). Machining efficiency is proportional to the hardness of each condition (Carpenter)[2]
- Forming, joining and machining are normally done in Condition A. H1150 and H1150M are the easiest to machine. On aging, H1000 shrinks 0.0004-0.0006 in/in and H1100 shrinks 0.0008-0.0012 in/in (MIL-HDBK-5J)[7]
- Before heat treatment, brazing or pickling, remove lubricants and cutting fluids (especially those containing sulfur) (ATI)[1]
📚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/Data%20Sheets/13-8Mo_Datasheet.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/Documents/datasheets/stainless-specialty-steel/preci…
- atimaterials.com https://www.atimaterials.com/Products/ati-13-8-mil
- everyspec.com https://everyspec.com/MIL-HDBK/MIL-HDBK-0001-0099/MIL_HDBK_5J_139/
- aubertduval.com https://aubertduval.com/wp-content/uploads/2024/12/MARVAL13X_FR.pdf
- knowledge.bsigroup.com https://knowledge.bsigroup.com/products/aerospace-series-steel-x3crnimoal13-8-2-1-4534-vac…
- saemobilus.sae.org https://saemobilus.sae.org/content/ams5629j
- standards.sae.org http://standards.sae.org/ams5864/
- astm.org https://astm.org/Standards/A564.htm
- store.astm.org https://store.astm.org/standards/a693
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