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steel

JIS FCD450 Ductile Iron: A536 Grade 65-45-12 Equivalent — Nodular Cast Iron for Crankshafts & Gears

FCD450 (JIS G5502) is Japan's A536 Grade 65-45-12 equivalent ductile iron — 450 MPa tensile, 10% elongation. Full guide: GJS-450-10 equivalent, all FCD grades, austempering to ADI, and when FCD outperforms FC gray iron.
2026.06.07
steel
steel

JIS FC200 Cast Iron: A48 Class 30 Equivalent — Gray Cast Iron for Machine Bases & Engine Blocks

FC200 (JIS G5501) is Japan's standard gray cast iron — flake graphite, ≥200 MPa tensile strength. Full guide: GJL-200 equivalent, all FC grades, vibration damping, machinability, and when to choose gray iron over ductile iron.
2026.06.07
steel
steel

SN400 / SN490 vs A992: Seismic Structural Steel Equivalent Grades & Properties

SN400 and SN490 vs ASTM A992 equivalent grades, Fy/Fu ratio control, Charpy impact requirements, and seismic structural applications. JIS G3136 complete properties guide.
2026.06.03
steel
Heat Treatment

JIS SNCM439 Steel: AISI 4340 Equivalent — Ni-Cr-Mo Alloy Steel for Heavy-Section Parts

JIS SNCM439 is a Ni-Cr-Mo high-hardenability alloy steel nearest to AISI 4340 and EN 36CrNiMo4. Explore composition, mechanical properties, heat treatment, and selection vs. SCM440.
2026.06.02
Heat Treatment
steel

JIS SUJ2 Steel: 52100 Equivalent — High-Carbon Chromium Bearing Steel

SUJ2 (JIS G4805) is Japan's 52100-equivalent high-carbon chromium bearing steel — 1.0% C / 1.5% Cr, hardens to 62–65HRC. Full guide: 100Cr6 equivalent, heat treatment, cryogenic processing, and bearing fatigue life.
2026.06.01
steel
steel

JIS SUP7 Steel: SAE 9255 Equivalent — Si-Mn Spring Steel for Heavy-Duty Leaf Springs

JIS SUP7 is a Si-Mn alloy spring steel (JIS G4801) nearest to SAE 9255. Explore chemical composition, mechanical properties, heat treatment, and how it compares to SUP6 and SUP12.
2026.05.30
steel
steel

JIS SUP3 Steel: SAE 1075 Equivalent — High-Carbon Spring Steel for Thin-Section Applications

JIS SUP3 is a high-carbon spring steel (JIS G4801) nearest to SAE 1075/1080. Learn composition, mechanical properties, heat treatment, and when to choose it over alloy spring grades.
2026.05.29
steel
steel

SS400, S45C & SCM435: Steel Selection Guide for Mechanical Designers

SS400 (≈A36), S45C (≈1045), SCM435 (≈4135): learn how to choose the right JIS steel for your design. Includes chemical composition comparison, hardenability data, failure cases, and sourcing tips for engineers outside Japan.
2026.05.29
steel
steel

JIS SUP12 Steel: SAE 9262 Equivalent — Si-Cr Spring Steel for High-Fatigue Applications

JIS SUP12 is a Si-Cr alloy spring steel nearest to SAE 9262. Explore chemical composition, mechanical properties, heat treatment, and selection tips vs. SUP7.
2026.05.27
steel
steel

JIS SUP11A Steel: SAE 5160H Equivalent — Mn-Cr-B Spring Steel for Large-Section Springs

JIS SUP11A is a Mn-Cr-B alloy spring steel (JIS G4801) nearest to SAE 5160H. Learn composition, mechanical properties, heat treatment, and why boron makes it ideal for large cross-section springs.
2026.05.27
steel
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