NSSC Stainless Steel with HGE (Hydrogen Gas Embrittlement) Resistance

・NSSC STH2 NSSC’s original stainless steel grade: Lower Cr, Ni, and Mo than 316L-HiNi

・316L-HiNi Conforming to the High Pressure Gas Safety Act and the exemplified standards in the General High Pressure Gas Safety Regulations.

NSSC stainless steel with HGE resistance

NSSC STH2

High-strength, low-alloy type austenite stainless steel
with excellent HGE resistance

316L-HiNi

Type 316L stainless steel designed for high-pressure hydrogen use

NEDO Project

Participation in a New Energy and Industrial Technology Development Organization (NEDO) project and R&D for stainless steel that can be used in high-pressure hydrogen gas environments

NEDO Project

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stainless steel with HGE resistance. CONTACT

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日鉄ステンレス株式会社

High-strength, low-alloy type austenite stainless steel with excellent HGE resistance

NSSC STH2

Features and Applications

HGE resistance
NSSC STH2 is superior in hydrogen environments ranging from low-pressure and low-temperature to high-pressure gas environments.
High strength
As the strength (tensile strength) is approximately 1.2 times higher than 304L and 316L, thickness and weight can be reduced.
Price stability (reduced amounts of Cr, Ni, and Mo)
Because of the lesser contents of Ni and Mo, price-stability is higher than 316L-HiNi. (Approx. 40% less Cr, Ni, and Mo compared to 316L-HiNi)

The material data of NSSC STH2 in high-pressure hydrogen gas has been prepared by NEDO “Development of Technologies for Hydrogen Production, Transport and Storage Systems (2012 FY)” and “Development of Hydrogen Utilization Technologies (2017 FY)”.
NSSC STH2 can be used in hydrogen filling station environments (-40 to 85℃, maximum 90 MPa).

1. HGE resistance

High HGE resistance of both the base material and welded joint

High HGE resistance of both the base material and welded joint

NEDO “Development of Hydrogen Utilization Technologies” Results Report (Feb. 2018)
Base material: 12mm thickness, welded joint: welding material 309MoL, V-groove multi-pass TIG
Shield gas : Ar, Ar+2% N2 SSRT: φ2.5×20L, 5×10^-5mm/s

2. High strength

Physical properties

2B，1.2mm

Physical properties

Density: Underwater suspension method
Specific heat, thermal conductivity: Laser flash method
Electrical resistivity: 4 terminal method
Coefficient of thermal expansion: Horizontal differential detection method
Module of elasticity: Resonance method
Magnetic permeability: Specimen resonance method (set magnetic susceptibility: 1000 Oe)

Mechanical properties

2B，1.2mm

Mechanical properties

Test piece shape: JIS13B
Test conditions: Stress control 10 MPa/s up to 0.2% YP, 25 mm/s beginning from 0.2% YP (Conforming to JIS Z 2241)
Measured items: 0.2% proof strength, tensile strength, uniform elongation, fracture elongation, hardness

3. Price stability

Approximately 40% less Cr, Ni, and Mo!

Approximately 40% less Cr, Ni, and Mo!

Mechanical properties
Temperature dependence (-70 to 200℃)

機械的性質温度依存性

Test piece shape: JIS13B
Test conditions: Stress control 10 MPa/s up to 0.2% YP,
25 mm/s beginning from 0.2% YP (Conforming to JIS Z 2241)
Measurement temperatures: -70, -40, -10, 25, 50, 100, 150, 200°C
Measured items: 0.2% proof strength, tensile strength (TS), fracture elongation (EL)

Corrosion resistance

JASO-CCT2B，1.2mm

Corrosion resistance

Test piece shape: 1.2t × 100L × 50W
Surface condition: #600 polished
1 cycle: Spray of 5% NaCl solution (35°C, 2 h) → Drying (60°C, 4 h)
→Wet (50°C, 95% RH, 2 h)
Investigated items: Evaluated on surface after 6, 12, and 30 cycles.
Test n count: 3

Stress corrosion cracking resistance test2B，1.2mm

Stress corrosion cracking resistance test

Test piece shape: 1.2t × 75L × 10W, U-bend
Surface condition: #600 polished
Test conditions: 10, 20, 42% MgCl2, boiling, stress load in fluid
Investigated items: Time to cracking occurrence, max. 100 h
Test n count: 2

Available products

● Products such as sheet and strip, quarto plate, and wire and rods will be rolled out.
● Samples of sheet, strip, and quarto plate are available.

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regarding NSSC stainless
steel with HGE resistance. CONTACT Information