PH13-8Mo Stainless Steel (UNS S13800) - Precipitation Hardening Alloy Supplier of Round Bars & Forgings | Shanghai Hangbo Alloy Group
Date: 2026年7月31日 Categories: News Views: 294
By Shanghai Hangbo Alloy Group Co., Ltd. - China Supplier | ISO 9001:2015 | Est. 2012
Contact: sales@hangboalloy.com | WhatsApp (Lisa): +86 13611656360
Quick Answer: What Is PH13-8Mo?
PH13-8Mo (UNS S13800 / W.Nr. 1.4534) is a martensitic precipitation-hardening stainless steel with 13% Cr, 8% Ni, and 2% Mo that delivers a unique combination of high strength (up to 1517 MPa in H950 condition), excellent fracture toughness, and corrosion resistance superior to 17-4PH -- making it the reference alloy for aerospace fasteners, landing gear components, and nuclear reactor internals. Shanghai Hangbo Alloy Group supplies PH13-8Mo as round bars and forgings with AMS 5629/5934 certification.
Key Properties
| Property | Value (H1000 Condition) |
|---|---|
| UNS | S13800 |
| Density | 7.76 g/cm3 |
| Melting Range | 1400-1440C |
| Tensile Strength | >= 1413 MPa (>= 205 ksi) |
| Yield Strength 0.2% | >= 1310 MPa (>= 190 ksi) |
| Elongation | >= 10% |
| Hardness | 43-47 HRC |
| Key Standards | AMS 5629, AMS 5934, ASTM A564 |
Product Overview
PH13-8Mo represents the "premium upgrade" path from the widely-used 17-4PH (UNS S17400). While 17-4PH relies on copper precipitation for hardening (which can reduce toughness at peak strength), PH13-8Mo uses a more sophisticated NiAl-based precipitation system that provides superior fracture toughness at equivalent strength levels.
The alloy's strengthening mechanism is martensitic transformation followed by precipitation of ordered NiAl (beta-prime) particles during aging. The low carbon content (<=0.05%) and the absence of delta-ferrite stringers in the VIM/VAR double-melted structure result in excellent transverse ductility and impact toughness -- properties essential for aerospace structural components where triaxial stress states demand isotropic mechanical behavior.
Advantages over 17-4PH:
- Higher fracture toughness at equivalent strength.
- Better resistance to stress-corrosion cracking (SCC) in marine environments.
- No copper, eliminating copper-induced hot shortness during forging.
- Finer, more uniform precipitate distribution enabling larger section sizes with uniform properties.
Chemical Composition (wt.%)
| Element | Content |
|---|---|
| Cr | 12.25-13.25 |
| Ni | 7.5-8.5 |
| Mo | 2.0-2.5 |
| Al | 0.90-1.35 |
| C | <= 0.05 |
| Fe | Balance |
Mechanical Properties by Heat Treatment Condition
| Condition | Tensile (MPa) | Yield (MPa) | Elongation (%) | Hardness (HRC) |
|---|---|---|---|---|
| H950 (Aged 510C) | >= 1517 | >= 1448 | >= 8 | 45-50 |
| H1000 (Aged 538C) | >= 1413 | >= 1310 | >= 10 | 43-47 |
| H1050 (Aged 566C) | >= 1241 | >= 1138 | >= 12 | 39-43 |
| H1100 (Aged 593C) | >= 1034 | >= 931 | >= 14 | 34-38 |
Heat Treatment
Solution Treatment: 927+/-14C (1700+/-25F), hold 1 hour, oil quench or air cool to below 16C (60F) for complete martensitic transformation.
Aging: Per the H-condition table above. Higher aging temperature = lower strength + higher toughness + better SCC resistance. H1000 is the standard balanced condition for aerospace fasteners.
Applications
| Industry | Component |
|---|---|
| Aerospace | Wing attachment fasteners, landing gear actuator parts, structural pins |
| Nuclear | Reactor internal bolts, core support structures |
| Oil & Gas | High-strength corrosion-resistant fasteners, valve stems |
| Marine | Propeller shafts, pump shafts |
FAQ
Q1: PH13-8Mo vs 17-4PH? PH13-8Mo has higher fracture toughness, better SCC resistance, and no copper. 17-4PH is more widely available and lower cost.
Q2: Is it magnetic? Yes, martensitic structure -- ferromagnetic.
Q3: Weldable? Yes, with matching filler. Post-weld solution treat + age required.
Q4: Price? $25-45/kg EXW. Contact sales@hangboalloy.com.
Q5: Forms? Round bars (6-300 mm), forgings, wire. AMS 5629/5934 certification. SGS available.
Contact & Complete Product Range
Shanghai Hangbo Alloy Group Co., Ltd. - China Supplier
Email: sales@hangboalloy.com | WhatsApp (Lisa): +86 13611656360 | www.nickel-alloy.com
All Grades
Ni: NI200, NI201, N4, N5, N6 | Monel: 400, 401, 404, K-500 | Inconel: 600-718, X-750, 725 | Incoloy: 800-926, A-286 | Hastelloy: C-276-C-2000, G-30, X, B-2, B-3, N | Nimonic: 75-263 | Haynes: 25-556 | Precision: 1J22-4J45 | High-Strength: 18Ni250, 18Ni300, AerMet100, PH13-8Mo
Bars(6-500mm) | Tubes(OD 6-610mm) | Plates(0.1-100mm) | Forgings | Welded Pipes | Fittings | Wire(0.05-10mm) | Strip(0.02-4.0mm)
SGS/BV/TUV inspection. www.nickel-alloy.com
