718 Tool Steel

Features of 718 Tool Steel

• 1 718 tool steel-plastic mold steel
  ASSAB 718 tool steel is a good quality plastic mold steel, normal forging making it for get high quality. It is equivalent with GB 3Cr2NiMo, Din W-Nr 1.2738, AISI P20+Ni, JIS ISO 35CrNiMo2.
   
  Inconel 718 Chemical composition as below:
   
  ELEMENT    C      Si       Mn      Mo          Cr       Ni
  contents（%）0.28~0.40  0.20~0.80  0.60~1.00 0.30~0.55  1.40~2.00 0.80~1.20
   
  718 tool steel Application
   
  718 steel Usage is same as the mold steel P20 type, but as a result of better hardenability, superior performance, can make size large, high-grade plastic mold forming parts
   
  Add hard processing
   
  For improve Injection mold life up to 800000 times more, can be implemented on pre hardened steel quenching and low temperature tempering and hard way to achieve. In 500-600 ℃ preheat before quenching when 2-4 hours, and then in 850-880 ℃ heat preservation time (at least 2 hours), into the oil cooled to 50-100 ℃ oil air cooling, hardness after quenching can reach 50 to 52 HRC, so as to prevent cracking should be 200 ℃ low temperature tempering processing, immediately after tempering hardness can keep more than 48 HRC.
   
  Nitriding treatment
   
  Nitriding treatment can get high hardness surface structure, surface hardness after nitriding of 650-700 HV
  (57 to 60 HRC) die life can reach more than 1 million times, nitride layer with compact structure, smooth features, mold stripping and wet air and alkali corrosion resistance improved.
   
  Quenching and tempering (Q+T)
   
  Quenching temperature 840 ~ 870 ° C, tempering temperature 200 ~ 500 ° C, 50 to 55 HRC hardness
  
  
  

  ■ PLASTIC MOULD STEEL

  塑胶模具钢

  编号 NO:	近似钢号					用途	Application
  	中国GB	美国AISI	德国DIN	日本JIS	外企 Foreign Enterprise
  1	3Cr2Mo	P20	1.2311			预硬注塑模，可一般抛光	For pre-hardened pouring plastic mold,can polish currently
  2	3Cr2NiMo	P20+Ni	1.2738		ASSAB71B	预硬大尺寸注塑模，可一般抛光	For pre-hardened big sizes of pouring plastic mold, can polish generally
  3	15Ni3Mn	P21			NAK80	预硬度高，可机加工，可焊接的镜面塑胶模	Good pre-hardened,plastic mold of mirror surface, can be machined and welded
  4	2Cr13	410	1.4021	SUS410		汽轮机叶片	Vane for sreamer
  5	4Cr13	420	1.2083	SUS420J2	ASSAB S136	抗锈蚀，镜面抛光的镜片模与塑胶模	For mold of polishing glasses and plastic
  6	3Cr17NiMnMo	420	1.2316	SUS420J2	BOHLER M300	高抗锈蚀的塑胶模	For mold of plastic with stronger corrupt-resisting

   

  编号 NO:	塑胶模具钢化学成份(% ) Chemical composition											退火状态 硬度≤ Annealed  Hardness	热处理温度(℃) Heal treatment temp		回火硬度 HRC Secondary hardness
  	C	Si	Mn	P≤	S≤	Cr	W	Mo	Cu	V	Al		淬火  Hardening	回火 Tempering
  1	0.35	0.60	0.85	0.030	0.030	1.80	—	0.45	—				预硬 Pre-hardening		29-35
  2	0.38	0.35	1.30	0.030	0.015	1.90	1.00	0.35	—				预硬 Pre-hardening		30-36
  3	0.15	0.35	1.00	0.030	≤0.015	0.30	3.20	0.30	1.00		1.00		预硬 Pre-hardening		37-43
  4	0.20	≤1.00	≤1.00	0.035	0.030	13.00	≤0.60	—	—			223	960	700	29-34 50-52
  5	0.39	0.60	0.80	0.028	0.020	13.50	≤0.60	—	—			255	预硬1025	预硬510	28-34
  6	0.39	W1.00	0.80	0.028	0.020	16.00	≤1.00	1.20	—			255	预硬1010	预硬500	44