Characteristics for large long-life plastic injection mold, such as home appliances, computer case, such as mold. High surface finish of plastic mold blow mold due to the high hardness, can be used to slide the plastic mold forming tool; depending on production needs can be applied flame hardening or nitriding treatment of mold parts. Steel Type: Pre-hardened plastic mold steel steel Features: polishing, galvanic corrosion, welding and machining of good factory state: After hardening and tempering to HB290-330 pure steel vacuum degassing refining process for polishing or etching request grain processing plastic mold. Pre-hardened state of supply, without heat treatment can be used directly in the mold processing, shorten the construction period. After forging rolling processing, compact, 100% ultrasonic inspection of imported 440C material, non-porous, needle defects. Nitriding nitriding surface tissue can be obtained with high hardness, surface hardness after nitriding reached 650-700HV (57-60HRC) die life can reach more than one million times, the nitride layer having a dense 440C, smooth characteristics, mold Stripping and anti-corrosive wet air and lye can improve. Hardening process in order to improve die life up to 80 million times or more, can pre-hard steel quenched and tempered low and hard ways. Quenching preheated at 500-600 ℃ 2-4 hours and then at 850-880 ℃ holding a certain time (for at least 2 hours) 440C stainless steel, into the oil cooled to 50-100 ℃ oil air cooling, hardness after quenching up 50-52HRC 440C tool steel, to prevent cracking should be 200 ℃ tempering treatment immediately after tempering, the hardness can be maintained over 48HRC Yong Wei steel mold (Dongguan) Co., Ltd. | 440C stainless steel | Shenzhen 440C steel mold by Yong Wei (Dongguan) Limited. Search for "mold steel, DC53, SKD11.SUS440C, SUS420" fly suppliers, network operators choose to have a full alliance Certified: Dongguan City An Yongwei steel mold shop (www.dgyongwei.com), trustworthiness and reliability, now click on "Commercial Union customer service" on page live chat with us now!