What are the specifications of 13-8 Mo Seamless Pipe?

Available in UNS S13800 (PH 13-8 Mo), OD 1/2"-14" NB, heavy wall / Sch 40S-160, VIM/VAR double-vacuum melted construction, supplied solution annealed or age-hardened.

What sets 13-8 Mo apart from 17-4 PH and 15-5 PH?

13-8 Mo uses aluminum (rather than copper) for precipitation hardening and is produced via VIM/VAR double vacuum melting, delivering higher ultimate strength (up to 1400+ MPa), superior notch toughness, and better stress corrosion cracking resistance.

Where is 13-8 Mo pipe typically used?

It is used in critical aerospace, defense, and nuclear applications where maximum strength-to-weight ratio, high fracture toughness, and resistance to environmental cracking are required under extreme loads.

Does Sakshi Forge provide Material Test Certificates (MTC) for 13-8 Mo Seamless Pipe?

Yes, MTC as per EN 10204 3.1 is provided with every dispatch along with heat-treatment, hardness, and ultrasonic inspection documentation.

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13-8 Mo Seamless Pipe - Ultra-High Strength Precipitation Hardening Pipe | Sakshi Forge

VIM/VAR Double Vacuum Melted Ultra-High Strength (1350 MPa Yield) PH Stainless Pipe

VIM/VAR double vacuum remelted for ultimate micro-cleanliness, fatigue strength, and fracture toughness

Precipitation hardenable up to 1350 MPa yield strength via single-step low-temperature aging (H950 to H1150)

Superior resistance to stress corrosion cracking (SCC) compared to 17-4 PH and high-strength alloy steels

EN 10204 3.1 MTC100% PMI TestedISO 9001:2015 CertifiedHydrostatic Tested

Hygienic Steel Grade

Request Price Quote

MTC EN 10204 3.1 Included

Global Sea & Air Freight

Electro-Chemical Finish Certificate

Response turnaround: Under 2 hours

Product Profile

13-8 Mo (UNS S13800 / PH 13-8 Mo / EN 1.4534) is an ultra-high-strength, premium double-vacuum melted (VIM/VAR) martensitic precipitation-hardening stainless steel seamless pipe. Engineered for the most demanding aerospace, defense, and subsea structural applications, its chemistry consists of 12.25%-13.25% Chromium, 7.5%-8.5% Nickel, 2.0%-2.5% Molybdenum, and 0.90%-1.35% Aluminum. Through VIM (Vacuum Induction Melting) followed by VAR (Vacuum Arc Remelting), 13-8 Mo achieves extraordinary micro-structural cleanliness, eliminating harmful inclusions and directional weaknesses. Low-temperature age hardening (precipitating B2 NiAl intermetallic particles) yields tensile strengths up to 1450 MPa (210 ksi) and yield strengths up to 1350 MPa (195 ksi), combined with superior fracture toughness and outstanding resistance to stress corrosion cracking (SCC). Sakshi Forge manufactures 13-8 Mo seamless pipes per AMS 5629 and ASTM A564 standards, supplied Condition A or pre-aged (H950, H1000, H1050, H1100, H1150) for critical aerospace landing gear hydraulics, missile structures, and subsea shafting.

Terminology & Abbreviations

UNS S13800|S13800

PH 13-8 Mo|PH13-8Mo

Werkstoff 1.4534|1.4534

AMS 5629|AMS5629

Key Technical Facts

Alloyed with 12.25-13.25% Cr, 7.5-8.5% Ni, 2.0-2.5% Mo, and 0.90-1.35% Al

VIM (Vacuum Induction Melted) + VAR (Vacuum Arc Remelted) double vacuum processing ensures extreme purity

Precipitation hardening driven by microscopic B2 NiAl (nickel-aluminum) intermetallic compound formation

Yield strength reaches up to 1350 MPa (195 ksi) in H950 temper while retaining high notch toughness

Molybdenum addition boosts stress corrosion cracking (SCC) resistance in marine and industrial atmospheres

Low-temperature thermal aging (510°C - 620°C) guarantees minimal dimensional movement and no surface scaling

Manufactured via precision seamless extrusion and cold drawing per AMS 5629 / ASTM A564 (S13800)

Supplied Condition A or aged (H950, H1000, H1050, H1100, H1150) with full EN 10204 3.1 aerospace certification

Why Choose Sakshi Forge

Our commitment to sterile, high-purity processing makes us a trusted manufacturing partner globally.

100% Heat Lot Traceability

Every pipe stamped with heat number matching EN 10204 3.1 MTC

Positive Material Identification (PMI)

Handheld XRF testing on every length prior to dispatch

Advanced NDT Inspection

Hydrostatic test and Eddy Current / Ultrasonic flaw detection on all orders

Precision Cold Drawing

Tighter wall thickness tolerances and superior internal bore smoothness

Custom Cut Lengths

Fixed lengths up to 12 meters or custom cut-to-length options to eliminate jobsite scrap

Ferrite & Phase Balance Testing

Ferritescope testing for duplex and super duplex grades to ensure 40-60% phase balance

High-Temperature Stabilization

Controlled heat treatment to fully precipitate carbides and optimize creep life

Pan-India & Export Freight

Fast dispatch across India and seaworthy export packing for global projects

Extensive Mill Stocking

Immediate inventory availability in standard schedules from Sch 10S to Sch 160

Third-Party Inspection Approved

Full support for TUV, SGS, DNV, Bureau Veritas, and Lloyds audits

Frequently Asked Questions

Common technical and pricing queries regarding specifications and ordering.

13-8 Mo seamless pipe is specified under UNS S13800 / PH 13-8 Mo / AMS 5629 / ASTM A564. It features 13% Cr, 8% Ni, 2.25% Mo, 1.1% Al, VIM/VAR melting, and 1350 MPa yield strength.

Partner with Sakshi Forge for Reliable Industrial Steel Solutions

Delivering precision-engineered flanges, pipes, and forged steel components designed for strength, durability, and performance in critical high-pressure industrial applications.