{"id":534,"date":"2026-02-24T08:36:29","date_gmt":"2026-02-24T08:36:29","guid":{"rendered":"https:\/\/www.jccncmachining.com\/material\/\/"},"modified":"2026-02-24T08:36:29","modified_gmt":"2026-02-24T08:36:29","slug":"stainless-steel-440c","status":"publish","type":"material_model","link":"https:\/\/www.jccncmachining.com\/ja\/materials\/stainless-steel\/stainless-steel-440c\/","title":{"rendered":"Stainless Steel 440C"},"content":{"rendered":"

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SS 440C Machining Capabilities<\/h3>\n\n\n\n\n\n\n\n\n
Capability<\/th>\nTechnical Description<\/th>\nJucheng Advantage<\/th>\n<\/tr>\n<\/thead>\n
Hard Turning<\/strong><\/td>\nTurning 440C in its fully hardened state (58-60 HRC) using PCBN (Polycrystalline Cubic Boron Nitride) inserts.<\/td>\nEliminates the need for grinding on some geometries, reducing cost while maintaining tight tolerances (+\/- 0.005mm).<\/td>\n<\/tr>\n
Bearing-Grade Grinding<\/strong><\/td>\nPrecision ID\/OD grinding to achieve roundness and concentricity within 1 micron.<\/td>\nWe produce custom bearing races and rollers that meet ABEC dimensional standards.<\/td>\n<\/tr>\n
Cryogenic Treatment<\/strong><\/td>\nDeep freezing parts after heat treatment to convert retained austenite to martensite.<\/td>\nEnsures maximum dimensional stability and hardness for parts used in precision metrology or aerospace.<\/td>\n<\/tr>\n
Superfinishing<\/strong><\/td>\nPolishing ground surfaces to Ra 0.05\u00b5m to reduce friction and wear.<\/td>\nEssential for high-speed shafts and valve seats to prevent seizing and extend service life.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

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Fabrication Guidelines for Stainless 440C<\/h3>\n

Annealed vs. Hardened:<\/strong>
\nWe machine the general shape in the annealed condition (easy to cut) and finish-grind after heat treatment. Tip:<\/strong> Always leave 0.3mm – 0.5mm grinding stock to remove heat-treat distortion.<\/p>\n

Corrosion Resistance:<\/strong>
\n440C has better corrosion resistance than tool steels (like D2) but worse than 304. Tip:<\/strong> Ideally suited for applications involving mild moisture or lubricants, but not saltwater immersion.<\/p>\n

Brittleness:<\/strong>
\nAt 60 HRC, 440C is very hard but brittle. Tip:<\/strong> Avoid thin, unsupported walls or sharp internal corners which can crack during quenching.<\/p>\n<\/div>\n

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Primary Applications<\/h3>\n

Rolling Element Bearings<\/strong>
\nBalls, rollers, and races. 440C is the standard for corrosion-resistant bearings.<\/p>\n

Valve Components<\/strong>
\nHigh-pressure valve seats and needle tips that must seal perfectly and resist erosion from fluid flow.<\/p>\n

Mold Inserts<\/strong>
\nSmall, high-wear cores in plastic injection molds, especially for abrasive glass-filled plastics.<\/p>\n

High-End Cutlery<\/strong>
\nPremium knife blades and surgical shears requiring the ultimate razor edge retention.<\/p>\n<\/div>","protected":false},"excerpt":{"rendered":"

SS 440C Machining Capabilities Capability Technical Description Jucheng Advantage Hard Turning Turning 440C in its fully hardened state (58-60 HRC) using PCBN (Polycrystalline Cubic Boron Nitride) inserts. Eliminates the need for grinding on some geometries, reducing cost while maintaining tight tolerances (+\/- 0.005mm). Bearing-Grade Grinding Precision ID\/OD grinding to achieve roundness and concentricity within 1 micron. We produce custom bearing races and rollers that meet ABEC dimensional standards. Cryogenic Treatment Deep freezing parts after heat treatment to convert retained austenite to martensite. Ensures maximum dimensional stability and hardness for parts used in precision metrology or aerospace. Superfinishing Polishing ground surfaces to Ra 0.05\u00b5m to reduce friction and wear. Essential for […]<\/p>\n","protected":false},"featured_media":535,"template":"","meta":[],"class_list":["post-534","material_model","type-material_model","status-publish","has-post-thumbnail","hentry"],"_links":{"self":[{"href":"https:\/\/www.jccncmachining.com\/ja\/wp-json\/wp\/v2\/material_model\/534","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.jccncmachining.com\/ja\/wp-json\/wp\/v2\/material_model"}],"about":[{"href":"https:\/\/www.jccncmachining.com\/ja\/wp-json\/wp\/v2\/types\/material_model"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.jccncmachining.com\/ja\/wp-json\/wp\/v2\/media\/535"}],"wp:attachment":[{"href":"https:\/\/www.jccncmachining.com\/ja\/wp-json\/wp\/v2\/media?parent=534"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}