Alloy structural steel company of excellent translation of Metal Products (Shanghai) (alloy structural steel made / imported alloy structural steel) 38crmo alloy structural steel / 38crmo steel plate / 38crmo steel bar / 38crmo steel coils / 38crmo steel strip / 38crmo steel pipe / 38crmo steel wire (good Translated Metal Products (Shanghai) Co., Ltd.) 
 Performance and application: 
 Alloy structural steel ------ 38CrMoAL Product Description: 38CrMoAL (GB/T3077-1999) ω /% Performance and Application: quenched and tempered plastic mold steel. Before nitriding, quenching, in order to obtain tempering sorbite, has good mechanical properties. The internal stress generated in the quenched and tempered stable is generally higher than the nitriding stability should be as small as possible, before nitriding West Lake machining process in order to stabilize the part size, and eliminate the stress of temperature should be lower than the tempering temperature, holding time is longer set out slowly cooled to room temperature. Large parts of the section size should not be normalizing, mold steel must be quenched, tempered, as the final heat treatment process may not be annealed. High surface hardness after nitriding or soft nitride surface (minimum hardness of 800HV), to improve wear resistance. 38CrMoAl special nitride steel, generally used only for the parts need to surface to a high degree of wear after nitrogen treatment, usually after nitriding surface hardness of 920HV above, pretreatment of quenching and tempering (usually quenched and tempered hardness ≥ 260HB, such as 262 ~ 302HB). 38CrMoAl nitride faster nitriding depth can be deeper, but the nitride layer of brittle and relatively large, and thus not suitable for making who have been the impact of the great parts. Abroad, usually containing aluminum nitride steel is not recommended for heavy duty gear (recommended use of the Cr-Mo-V class nitride steel): for the production of high wear resistance, high fatigue strength and considerable strength to deal with The high precision of dimensions nitride parts, such as imitation mode, cylinder liners, gears, pressure valves, boring bar, worm grinding machine spindle. But the larger part should not be used; widely used in plastics molding 
 38CrMo alloy steel, strength, 40Cr, 42CrMo similar general purposes:-axis, the pole strength requirements of the parts GM to do the wheel steering mold billet, special mold steel billets, plastic mold steel billet. 
 Chemical composition: 
 Silicon Si: 0.20 ~ 0.45 
 Mn Mn: 0.30 ~ 0.60 
 Sulfur S: Allow the residual content of ≤ 0.035 
 Phosphorus P: Allow the residual content of ≤ 0.035 
 Chromium Cr: 1.35 ~ 1.65 
 Aluminum Al: 0.70 ~ 1.10 
 Ni: to allow the residual content of ≤ 0.030 
 Cu: to allow the residual content of ≤ 0.030 
 Mo Mo: 0.15 to 0.25 
 Mechanical properties: 
 Tensile strength σb (MPa): ≥ 980 (100) 
 Yield strength σs (MPa): ≥ 835 (85) 
 Elongation δ5 (%): ≥ 14 
 Section shrinkage ψ (%): ≥ 50 
 Impact energy Akv (J): ≥ 71 
 Impact the toughness the value αkv (J/cm2): ≥ 88 (9) 
 Hardness: ≤ 229HB 
 Sample size: sample blank size of 30mm 
 Heat Treatment Specification: 
 Quenching 940 ° C, water-cooled, oil cooled; tempering 640 ° C, water-cooled, oil cooled. 
 Delivery status: to heat treatment (normalizing, annealing, or high-temperature tempering) or heat treatment state of delivery, the delivery status should be indicated in the contract. 
 The company provides domestic and imported alloy structural steel varieties, complete specifications, special specifications can be customized processing. Division I and the original certificates, material certificates (chemical composition, mechanical properties) of the class parameters Please pay attention to obtain a copy of the public are welcome to the user to inquire Order, the Company will be free shipping! If necessary other material, please contact us. 
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