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Japanese ・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 STH2 with high strength and price stability High pressure HGE resistance, High strength,and price stability (Lower Cr, Ni, and Mo than 316L) The use of hydrogen is expected to grow as a key means of reducing carbon emissions.Since 2013, NSSC has participated in a NEDO (*) project with NIPPON STEEL and conducted R&D for stainless steel that is suitable for use in hydrogen gas environments. NSSC stainless steel with HGE resistance NSSC STH2 High-strength, low-alloy type austenite stainless steelwith 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 Go here to contact us about NSSC stainless steel with HGE resistance. CONTACT From hydrogen production to utilization Hydrogen is expected to play an important role to achieve the carbon neutrality. As extremely clean energy at all stages from production to utilization, projects aimed at expanding the use of hydrogen are underway around the world. Suitable for a wide range of hydrogen energy environments In preparation for the coming hydrogen based society, NSSC has developed NSSC STH®2, which can be used in a wide range of hydrogen environments and features lower Cr, Ni, and Mo than 316L. Concept diagram showing usable hydrogen environments for each stainless steel Scroll sideways to view.▶▶▶ *1: Ni equivalent = Ni+0.72Cr+0.88Mo+1.11Mn-0.27Si+12.93C+0.53Cu+7.55N (Sanga’s equation) Recommended applications Hydrogen filling stations (pre-cooler, piping), hydrogen storage tanks NSSC stainless steelwith HGE resistance NSSC STH2 & 316L-HiNi Click here for details.▶︎ Go here to contact us regarding NSSC stainless steel with HGE resistance. CONTACT Information Type 316L stainless steel designed for high-pressure hydrogen use 316L-HiNi Specification in exemplified standards: Satisfies Ni equivalent ≥ 28.5(*2), can be used in hydrogen at -45 to 250℃ and 20 to 82 MPa.*2: Ni+0.72Cr+0.88Mo+1.11Mn–0.27Si+12.93C+0.53Cu+7.55N (Hirayama’s equation) Examples of 316L-HiNi mechanical properties (room temperature) 316L-HiNi steel shows reduction of area of 75% or more in atmosphere, and relative reduction of area of 98% in hydrogen and atmosphere. This result satisfies the material selection standard of 80%. Tensile properties in hydrogen at -40℃ and 70 MPa (representative example) φ3 mm round bar test piecesTest temp.: -40℃Strain rate: 5.0×10-5/s(Conforms to test conditions specified by the High Pressure Gas Safety Institute of Japan.) Appearance of test piece after tensile test in gaseous hydrogen at 70 MPa pressure Available products Go here to contact us regarding NSSC stainless steel with HGE resistance. CONTACT Information High-strength, low-alloy type austenite stainless steel with excellent HGE resistance NSSC STH2 Features and Applications HGE resistanceNSSC STH2 is superior in hydrogen environments ranging from low-pressure and low-temperature to high-pressure gas environments. High strengthAs 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 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 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 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! Mechanical propertiesTemperature dependence (-70 to 200℃) 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 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 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. Go here to contact us regarding NSSC stainlesssteel with HGE resistance. CONTACT Information Copyright © 2023 NIPPON STEEL Stainless Steel Corporation, All Rights Reserved