{"id":532,"date":"2026-02-24T08:26:21","date_gmt":"2026-02-24T08:26:21","guid":{"rendered":"https:\/\/www.jccncmachining.com\/material\/\/"},"modified":"2026-02-24T08:26:21","modified_gmt":"2026-02-24T08:26:21","slug":"stainless-steel-420","status":"publish","type":"material_model","link":"https:\/\/www.jccncmachining.com\/ko\/materials\/stainless-steel\/stainless-steel-420\/","title":{"rendered":"Stainless Steel 420"},"content":{"rendered":"

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SS 420 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
Mold Cavity Machining<\/strong><\/td>\n420 is the standard for plastic injection molds requiring corrosion resistance (e.g., PVC molding). We mill complex 3D contours.<\/td>\nOur high-speed HSM centers can finish-machine hardened 420 mold cores, reducing the need for EDM and manual polishing.<\/td>\n<\/tr>\n
Mirror Polishing<\/strong><\/td>\n420 stainless has a fine grain structure that allows it to be polished to an SPI A-1 mirror finish without pitting.<\/td>\nWe provide optical-grade polishing services for 420 lens molds and cosmetic automotive lighting tools.<\/td>\n<\/tr>\n
Hard Milling & Turning<\/strong><\/td>\nMachining 420 in its hardened state (48-52 HRC) to hold final tolerances after heat treatment.<\/td>\nEliminates heat-treat distortion. We use CBN and ceramic tools to cut the hardened steel efficiently.<\/td>\n<\/tr>\n
Precision Grinding<\/strong><\/td>\nSurface and cylindrical grinding of 420 shafts and blades to create sharp cutting edges and tight fits.<\/td>\nEssential for manufacturing industrial shear blades and surgical instruments that must stay sharp.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

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Fabrication Guidelines for Stainless 420<\/h3>\n

Heat Treatment is Key:<\/strong>
\nIn the annealed state, 420 is gummy and tough. It performs best when hardened (Quench & Temper) to 50-52 HRC<\/strong>. Tip:<\/strong> Machine rough features in annealed state, leave stock, heat treat, then hard-mill\/grind to finish.<\/p>\n

Corrosion Resistance:<\/strong>
\n420 has good corrosion resistance only in the hardened and polished<\/strong> condition. A rough or annealed surface will rust. Tip:<\/strong> Do not use for marine applications; use it for indoor or oiled environments.<\/p>\n

Weldability:<\/strong>
\nVery Poor.<\/strong> Air hardening causes immediate cracking. Welding requires pre-heating to 200\u00b0C+ and post-weld annealing.<\/p>\n<\/div>\n

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Primary Applications<\/h3>\n

Plastic Injection Molds<\/strong>
\nMold cores and cavities (like Stavax type) for molding corrosive plastics or optically clear parts (polycarbonate lenses).<\/p>\n

Surgical Instruments<\/strong>
\nScalpels, scissors, and dental tools requiring a hard, sharp cutting edge and sterilization resistance.<\/p>\n

Industrial Blades<\/strong>
\nShear blades, needle valves, and cutlery requiring high wear resistance.<\/p>\n

Shafts & Axles<\/strong>
\nPump shafts and gear shafts that need higher strength and hardness than 304\/316 can provide.<\/p>\n<\/div>","protected":false},"excerpt":{"rendered":"

SS 420 Machining Capabilities Capability Technical Description Jucheng Advantage Mold Cavity Machining 420 is the standard for plastic injection molds requiring corrosion resistance (e.g., PVC molding). We mill complex 3D contours. Our high-speed HSM centers can finish-machine hardened 420 mold cores, reducing the need for EDM and manual polishing. Mirror Polishing 420 stainless has a […]<\/p>\n","protected":false},"featured_media":533,"template":"","meta":[],"class_list":["post-532","material_model","type-material_model","status-publish","has-post-thumbnail","hentry"],"_links":{"self":[{"href":"https:\/\/www.jccncmachining.com\/ko\/wp-json\/wp\/v2\/material_model\/532","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.jccncmachining.com\/ko\/wp-json\/wp\/v2\/material_model"}],"about":[{"href":"https:\/\/www.jccncmachining.com\/ko\/wp-json\/wp\/v2\/types\/material_model"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.jccncmachining.com\/ko\/wp-json\/wp\/v2\/media\/533"}],"wp:attachment":[{"href":"https:\/\/www.jccncmachining.com\/ko\/wp-json\/wp\/v2\/media?parent=532"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}