718H It's plastic mold steel   composition

Elements	C	Si	Mn	Cr	MO	Ni
content(%)	0.33	0.3	1.4	2.0	0.2	0.9

  Factory hardness: Pre hardened to 35-39HRC&emsp& emsp; Features: 718H is a vacuum melted chromium nickel molybdenum alloy steel that undergoes quenching and tempering treatment before leaving the factory. It has the following advantages: no risk of quenching cracking and heat treatment deformation; No heat treatment fee is required; Shorten the mold production cycle; Reduce the cost required for molds (e.g. no need for Qiaozheng deformation); The mold is easy to modify; Nitriding and fire eye hardening treatment can be applied to enhance the surface hardness and wear resistance of the mold& emsp;& emsp; The main use of 718H is for large long-life plastic injection molds, such as molds for household appliances, computer casings, etc; Plastic product molds with high surface finish; Blow molding; Due to its high hardness, it can be used as a slider in plastic molds; Forming tool, compression brake die (bay plate machine die), (flame hardening or nitriding treatment can be applied depending on production needs); Construct components and shafts& emsp;& emsp; Heat treatment:& emsp; Annealing&emsp& emsp; In a protected state, heat to 700 ℃, evenly heat and cool to 600 ℃ in the furnace at a rate of 15 ℃/h, and then air cool& emsp;& emsp; Stress relief&emsp& emsp; After rough processing, heat to 550 ℃, hold for 2 hours, slowly cool to 500 ℃, and then air cool。