Martensitic Stainless Steel Forged Ring – 410 / 420 / 431 / 440C

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Martensitic stainless steel forged rings and hollow bars (grades 410, 420, 431, 440C, etc.) are heat-treatable, high-hardness, and wear-resistant components with excellent mechanical strength and good corrosion resistance. The hollow bar form offers near-net shape geometry, reducing material waste and machining time compared to solid bar drilling.

Main Applications:They are widely used in valve seats and bodies, bearing races, turbine rings and spacers, pump shafts and sleeves, flanges and connectors, as well as oil and gas industry components and mechanical seals.

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Specification

Grade	410, 420, 431, 440C
Standard	ASTM A182, A276, A479, EN 10222-5, GB/T 1220
Diameters	OD:50 mm – 2000 mm; ID:20 mm – 1800 mm; Height: 20 mm –6000 mm
Lengths	Usually 2 m to 6 m in straight bars; custom lengths available
Surface finish	Black (hot-rolled / forged), peeled, turned, ground, polished

Chemical Composition

Grade	C ≤	Si ≤	Mn ≤	P ≤	S ≤	Cr (%)	Ni (%)	Mo (%)	Other Elements (%)
410	0.15	1.00	1.00	0.040	0.030	11.5-13.5	-	-	-
420	0.15-0.40	1.00	1.00	0.040	0.030	12.0 - 14.0	-	-	-
431	0.20	1.00	1.00	0.040	0.030	15.0 - 17.0	1.25-2.50	-	-
440C	0.95-1.20	1.00	1.00	0.040	0.030	16.0 - 18.0	-	0.75	-

Mechanical Properties

Grade	Condition	Tensile Strength (MPa)	Yield Strength (MPa)	Elongation (%)	Hardness (HB)
410	Annealed	≥415	≥ 205	≥ 20	≤200
420	Annealed	≥690	≥415	≥15	≤235
431	Annealed	≥860	≥620	≥15	≤285
440C	Annealed	≥760	≥450	≥10	≤269

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