38CrMoAl 
 Alloy Steel 
 38CrMoAl alloy steel 
 Grade: 38CrMoAl Standard: GB / T 3077-1988 ● Features and Scope: 38CrMoAl have high surface hardness, wear resistance and fatigue strength, and has good heat resistance and corrosion resistance, hardenability is not high. For the production of high wear resistance, high fatigue strength and considerable strength to deal with high dimensional accuracy after nitride parts, such as the imitation model, cylinder liner, gear, high pressure valves, boring bar, worm, grinding spindles. However, part of a larger size should not be used. 38crmoal high nitrogen steel is mainly used for high wear resistance. High fatigue strength and considerable strength after heat treatment precisely sized nitride parts, or all is not subject to shock loading and wear resistance of high nitrogen parts, such as the boring bar. grinder spindle, automatic lathe spindle. worm. precision screw. Precision Gear high pressure valves stem. gauge. model. roller. imitation mode. Cylinder. compressor piston rod, the steam turbine governor. rotating sets of fixed sets, rubber and plastic extrusion machine on a variety of wear parts. 
 Chemical composition 
 ● Chemical Composition: C: 0.35 ~ 0.42 Si Si: 0.20 ~ 0.45 Manganese Mn: 0.30 ~ 0.60 S S: to allow the residual phosphorus content ≤ 0.035 P: ≤ 0.035 to allow the residual content of chromium Cr: 1.35 ~ 1.65 Aluminum Al: 0.70 ~ 1.10 Ni: to allow the residual content ≤ 0.030 Copper Cu: Mo to allow the residual content ≤ 0.030 Mo: 0.15 ~ 0.25 edit the mechanical properties of this paragraph 
 ● Mechanical Properties: Tensile σb (MPa): ≥ 980 (100) yield strength σs (MPa): ≥ 835 (85) Elongation δ5 (%): ≥ 14 Reduction of area ψ (%): ≥ 50 impacts Power Akv (J): ≥ 71 impact toughness αkv (J/cm2): ≥ 88 (9) Hardness: ≤ 229HB sample size: Sample size of 30mm rough edit this paragraph heat treatment specifications 
 ● Heat treatment and microstructure specifications: Heat treatment specifications: quenching 940 ℃, water, oil cooling; tempering 640 ℃, water-cooled, oil-cooling. ● Delivery status: to heat treatment (normalizing, annealing, or tempering) or heat treatment delivery, delivery status should be indicated in the contract 
 38CrMoAl alloy steel 
 . 
 38CrMoAl use 
 38CrMoAl All structural steel is a corrosion-resistant special steel seawater. A, 38CrMoAl alloy structural steel, mainly used to produce pipes and equipment. Highly resistant to corrosion, is also very easy to install and so on. Second, the capability corrosion reasons: (1) 38CrMoAl alloy structural steel compound of Al (aluminum), with the air of O (oxygen) chemical reaction of Al2O3 (aluminum oxide), thereby protecting the line into the film, both the corrosion and decay. (2) 38CrMoAl structural steel of the Cr (chromium), Mo (molybdenum), ions in seawater can be automatically added Cl (chlorine) ions formed by corrosion of the steel point gap to form a dense protective layer to prevent corrosion to develop in depth point . And then play a corrosion-resistant, so that longer life. Third, the welding material 38CrMoAl seamless welding performance is better, with a special corrosion-resistant welding rod "sea O3", no special welding requirements. Fourth, the application of seamless steel pipe materials 38CrMoAl example, the coastal power plants, oil fields along the coast, coastal water transportation of natural gas and petrochemical plants, oil and gas and seawater media with the best materials to pipeline and processing components. 38CrMoAl and type of material 42CrMo What is the difference 38CrMoAl is dedicated nitride steel, generally used only for highly wear-resistant surface required by the nitrogen treatment of the parts, usually after nitriding surface hardness 920HV or more, pretreatment of quenching (usually quenched hardness ≥ 260HB, such as 262 ~ 302HB). 38CrMoAl faster nitride, the nitride layer can be deeper depths, but the brittleness of the nitrided layer is relatively large, and therefore not suitable for who have been making a big impact in parts. Foreign steel is generally not recommended for aluminum nitride important heavy gear (recommended Cr-Mo-V nitride and other types of steel). 42CrMo strength, high hardenability, toughness, and quenching of small deformation, high temperature strength and high creep rupture strength. Requirements for the manufacture of high strength steel than 35CrMo and quenched forging greater cross-section, such as a big locomotive traction gears, supercharger gear, rear axle, a great link by the load and spring, can also be used 2000m deep drill pipe joints and the following oil and salvage tools. 
 Chinese and foreign brands were 
 China GB/T3077: 38CrMoAl international standard ISO: 41CrAlMo74 the former Soviet Union ГОСТ: 38X2MЮA (38XMЮA) United States ASTM: - U.S. UNS: - Japan JIS: SACM645 German DIN: 41CrAlMo7 34CrAlMo5 UK BS: 905M39 905M31 France NF: 40CAD6.12 30CAD6.12 ◆ round 38CrMoAl formula: Weight per meter (kg) = 0.00617 × diameter × diameter (Note: rebar and round the same) ◆ flat steel: weight per meter (kg) = 0.00785 × thickness × width ◆ pipe side: each m Weight (kg) = 0.02466 × thickness × (OD - Wall Thickness) ◆ plate: Weight per meter (kg) = 0.785 × thickness