15-5PH UNS S15500 XM-12 Age-Hardening Stainless Steel Bars and Plates
Derived from 17-4PH, this martensitic precipitation-hardening stainless steel features reduced copper and chromium content with marginally higher nickel composition. It delivers remarkable transverse toughness and good malleability, offering corrosion resistance comparable to 17-4PH, while its marine atmospheric stress corrosion resistance reaches peak performance under H900 aging or tempering above 523°C. Its mechanical strength can be precisely adjusted through customized aging heat treatment, making it well-suited for dynamic load-bearing components used in aerospace and marine engineering. The material carries higher raw alloy costs and requires rigorous, standardized welding procedures during fabrication.
Applications of 15-5PH
This high-strength corrosion-resistant alloy meets strict industrial standards for aerospace, petrochemical, medical, heavy machinery and power generation applications.
- Aerospace: It is used to manufacture aircraft components, missile components, engine parts and so on, which requires a service environment with high strength, high toughness and good corrosion resistance.
- Petrochemical field: It is used to manufacture chemical equipment, valves and pumps, which can withstand corrosive media and high-pressure environment.
- Medical device field: Because of its good biocompatibility and corrosion resistance, it can be used to manufacture medical devices and implants.
- Mechanical manufacturing field: It is used to manufacture high-strength mechanical parts, such as gears, shafts and fasteners, etc.
Equivalent Grades and Commonly Used Specifications of 15-5PH
| Steel Grade | Specification | Specification Name |
|
0Cr15Ni5Cu4Nb / 05Cr15Ni5Cu4Nb / S51550 |
GB/T 1220 | Stainless steel bars |
| GJB 8268 | Specification for precipitation-hardening stainless steel bars for aviation | |
| UNS S15500 / XM-12/ 15-5PH | ASTM A564/A564M | Standard Specification for Hot-Rolled and Cold-Finished Age-Hardening Stainless Steel Bars and Shapes |
| ASTM A959 | Standard Guide for Specifying Harmonized Standard Grade Compositions for Wrought Stainless Steels | |
| ASTM A693 | Standard Specification for Precipitation-Hardening Stainless and Heat-Resisting Steel Plate, Sheet, and Strip | |
| AMS 5862 | Aerospace Material Specification-Steel, Corrosion-Resistant, Sheet, Strip, and Plate 15Cr-4.5Ni-0.30Cb(Nb)-3.5Cu Consumable Electrode Remelted, Solution Heat Treated Precipitation-Hardenable | |
| AMS 5659 | Aerospace Material Specification-Steel Corrosion Resistant, Bars, Wire, Forgings, Rings, and Extrusions 15Cr-4.5Ni-0.30Cb(Nb)-3.5Cu Consumable Electrode Remelted Solution Heat Treated, Precipitation Hardenable | |
| AMS-H-6875 | Heat Treatment of Steel Raw Materials | |
| BAC-5619 | Heat Treatment of Precipitation Hardening Stainless Steels | |
| AMS 5826 | Steel, Corrosion- and Heat-Resistant, Welding Wire 15Cr–5.1Ni–0.30Cb(Nb)–3.2Cu | |
| X5CrNiCu15-5 (1.4545) | EN 4842 | Aerospace series–X5CrNiCu15-5 (1.4545)–Consumable electrode remelted (ESR or VAR) – Solution treated and precipitation treated (H1025)–Bar for machining–a or D ≤ 250 mm 1070 MPa ≤Rm≤1200 MPa–Premium quality (pq) |
Typical Chemical Composition of 15-5PH
|
Elements |
C | Si | Mn | P | S | Ni | Cr | Cu | Nb |
| Contents% | ≤0.07 | ≤1.00 | ≤1.00 | ≤0.040 | ≤0.030 | 3.50~5.50 | 14.00~15.50 | 2.50~4.50 |
0.15~0.45 |
| Products produced as per other specifications or technical agreements (if need) are available. | |||||||||
Typical Heat Treatment Condition and Mechanical Properties of 15-5PH
|
Delivery Condition |
Mechanical Properties and Hardness of Heat-Treated Specimens | ||||||
| Rp0.2/(N/mm2) | Rm/(N/mm2) | A/% | Zb/% | Akv2d/J | HBW |
HRC |
|
|
Solution Treated（1040℃±15℃） |
/ | / | / | / | ≤363 | ≤38 | |
| Precipitation Hardening（H900, 480℃, 1h, air） | ≥1170 | ≥1310 | ≥10 | ≥35 | / | ≥388 |
≥40 |
|
Precipitation Hardening（H925, 495℃, 4h, air） |
≥1070 | ≥1170 | ≥10 | ≥38 | ≥6.8 | ≥375 | ≥38 |
| Precipitation Hardening（H1025, 550℃, 4h, air） | ≥1000 | ≥1070 | ≥12 | ≥45 | ≥20 | ≥331 |
≥35 |
|
Precipitation Hardening（H1075, 580℃, 4h, air） |
≥860 | ≥1000 | ≥13 | ≥45 | ≥27 | ≥311 | ≥32 |
| Precipitation Hardening（H1100, 595℃, 4h, air） | ≥795 | ≥965 | ≥14 | ≥45 | ≥34 | ≥302 |
≥31 |
|
Precipitation Hardening（H1150, 620℃, 4h, air） |
≥725 | ≥930 | ≥16 | ≥50 | ≥41 | ≥277 | ≥28 |
| Precipitation Hardening（H1150M, 760℃, 2h, air; plus 620℃, 4h, air） | ≥515 | ≥795 | ≥18 | ≥55 | ≥75 | ≥255 |
≥24 |
| Products produced as per other specifications or technical agreements (if need) are available. | |||||||
Process Properties
The hot working temperature range is 1000~1205℃,and the appropriate hot working temperature is 1175~1205℃.This kind of steel does not contain ferrite and can be forged by upsetting and flattening,and should be quickly cooled to below 30℃after forging.
Relationship Between Stress Corrosion and Yield Strength in Saturated H2S
When the stress is 345MPa, different tempering and aging technologies are used to obtain different yield strengths; the number in parentheses represents austenite content, and the number on the side of the numerical point represents tempering and aging temperature (℉).
Product Forms and Size Range of 15-5PH
|
Product forms |
Size range |
|
Bars |
Diameter or side length: 5.0mm~1000mm |
| Flats |
thickness: 4.0mm~1000mm width: 300mm~2200mm |
| Produce as other form and size according to technical requirements are available. | |
