276 TECHNICAL INFORMATION 1. General Steel Materials 2. Stainless Steel Materials <Reference: Corrosion Resistance of Stainless Steel> Testing Method Conforms to the JIS H 8502 Cycle Test Method as a complex corrosion test Test Conditions (1) Salt water spray test (5%NaCI. 35˚C) 2hr (2) Drying (60˚C) 4hr (3) Wetting (95%RH. 35˚C) 2hr One cycle takes 8 hr. Appearance of test piece 48 hr, 168 hr before test. SS400 SUS440C SUS304 SUS316 *G−STAR Before test 48hr 168hr * G-STAR is martensite stainless steel (pre-hardened steel) manufactured by the Daido Special Steel Co., Ltd. Type Material Code Applications Comment JIS Flat Bar Square Bar Hexagonal Bar Round Bar Steel Plate Section Steel Rolled Steel for General Structure SS400 General Machine Parts Fine Workability and Weldability JIS G 3101 O O O O O Polished Steel Bar (Cold-Drawn) SS400D General Machine Parts Excellent Precision and Surface Roughness. Ready for use directly after slight cutting. − O O O O Carbon Steel for Machine Structural Use S45C General Machine Parts Fit for Hardening Tensile Strength 58kgf/mm2 JIS G 4051 O O O O O S50C Fit for Hardening Tensile Strength 66kgf/mm2 Carbon Tool Steel SK4 Shafts, Pins, etc. For Drill Rod (Round Bar) SK4 surface-finished after cold drawing. Class 7(−DG7)=h7 Class 8(−DG8)=h8 Class 9(−DG9)=h9. JIS G 4401 O O SK5 O O O Alloy Tool Steel SKS93 Hardening Parts Deformation caused by Hardening is much less than that of SK material. JIS G 4404 O O O SKS3 Chrome Molybdenum Steel SCM435 General machine Parts requiring strength. Screws, etc. Tensile Strength 70kgf/mm2, Tensile Strength after Hardening & tempering: 95 kgf/mm2 or more. Hardness: HB270 or more. Hardening: HRC50 or more. JIS G 4105 O O O O O SCM415 SCM420 Sulfuric and Sulfur Compound Free Cutting Steel SUM21 General Machine Parts (Free-Cutting steel) Made of carbon steel plus sulfur to enhance machinability. JIS G 4804 O O O SUM22L Free-Cutting Steel containing sulfur and lead. SUM24L High Carbon Chrome Bearing Steel SUJ2 Roller bearings, etc. Bearing Steel JIS G 4805 O Cold-Rolled Steel Plate SPCC Covers, cases, etc. Rolled at an almost ambient temperature. High dimensional precision and fair texture. Fine machinability. Easy to bend, wring and cut. Fine Weldability. JIS G 3141 O Hot-Rolled Steel Plate SPHC General machine structural parts. Plates for general use are 6 mm or less in thickness. JIS G 3131 O Type Material Code Applications Comment Magnetism JIS Flat Bar Square Bar Hexagonal Bar Round Bar Steel Plate Section Steel Austenite SUS303 Machine parts requiring antirusting 18-8 Free-Cutting Stainless Steel, NonMagnetic. More Machinable than SUS304 None* JIS G 4303~ Good Good Austenite SUS304 Machine parts requiring antirusting Most Versatile Antirusting and HeatResisting Steel for General Use None* Good Good Good Good Good Good Austenite SUS316 Machine parts requiring antirusting More resisting to seawater and other media than SUS304. None* Good Good Good Martensite SUS440C Machine parts requiring antirusting (Less corrosion resistant than austenite.) Fit for Hardening. Available Good Martensite SUS410 Machine parts requiring antirusting (Less corrosion resistant than austenite.) Fit for Hardening. Fine Machinability. Available Good *EMartensite exhibits magnetic properties. Machining of Austenite may cause magnetic properties. Materials Varieties and Applications
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