what does st70 st60 st52 st37 st27 mean

GB/T 3077 12Cr1MoV Alloy Steel Plate

ength and anti-oxidant properties, have higher durable plastic. The production process is relatively simple, and good weldability, but normalizing cooling rate sensitive._GB/T 3077 12Cr1MoV Chemical Composition:__ _ Grade_ The Element Max (%)_ _ _ C_ Si_ Mn_ P_ S_ _ _ 12Cr1MoV_ 0.08~0.15_ 0.17~0.37_ 0.40~0.70_ 0.035_ 0.035_ __GB/T 3077 12Cr1MoV Mechanical Property:__ _ Grade_ 12Cr1MoV Mechanical Property_ _ _ Thickness_ Yield_ Tensile_ HB_ _ _ 12Cr1MoV_ mm_ Min Mpa_ Mpa_ HB_ _ _ 6-50_ 245_ 490_ _ _ _ 50-200_ 245_ 490_ _ __GB/T 3077 12Cr1MoV covers the following issues of hot rolled and forging alloy steel: the dimension, shape, weight, tolerance, engineering specification, test method, inspection rules, packaging, marking, and quality certificates._

GB/T 3077 15CrMo alloy steel

ance is very good._The 15CrMo-series Pearlite-heat-resisting steels have high thermal strength (Δb≥440mpa) and anti-oxidation at high temperature, and have certain capability of resisting hydrogen corrosion. Because of the high content of CR, C and other alloying elements in steel, the hardening tendency of steel is obvious and the weld ability is poor._15CrMo steel chemical composition:__ _ Grade_ 15CrMo steel chemical composition (mass fraction) ( % )_ _ _ _ C_ Mn_ Si_ Cr_ Mo_ Ni_ Nb + Ta_ S_ P_ _ _ 15CrMo_ 0.12 ~ 0.18_ 0.40 ~ 0.70_ 0.17 ~ 0.37_ 0.80 ~ 1.10_ 0.40 ~ 0.55_ ≤0.30_ __ ≤0.035_ ≤0.035_ __15CrMo mechanical properties of steel_

GB/T 3077 20CR alloy steel

alloy chromium, molybdenum, nickel case hardening steel. Oil Quenched & Tempered Hardness is 28-34 HR c. GB 20Cr steel Annealing delivery hardness less than 250HB.20Cr with a lower carbon content range, So GB 20Cr alloy steel have good weld ability._GB/T 3077 20CR Chemical composition:__ _ C(％)_ 0.18～0.24_ Si(％)_ 0.17～0.37_ Mn(％)_ P(％)_ _ _ S(％)_ ≤0.030_ Cr(％)_ 0.70～1.10_ 0.50～0.80_ ≤0.030 _ __GB/T 3077 20CR alloy steel mechanical property:__ _ Tensile Strength (σb/MPa)_ Yield point (σs/MPa)_ Elongation (δ5/%)_ Reduction of Area (ψ/%)_ Impact Absorbing Energy(Aku2/J)_ Brinell Hardness(HBS100/3000)_ _ _ Annealing or High Tempering_ _ _ ≥835_ ≥540_ ≥10_ ≥40_ ≥47_ ≤179_ __GB/T 3077 20CR steel application:_ 20CR steel is mainly used for making cam shaft, driven gears of small tractor. This kind of steel also is mostly used in the manufacturing of the high demand  heart intensity, surface under wear, section under 30 mm or complex and not big load carburized parts (oil quenching), such as: machine tool transmission gear, gear shaft, worm and piston pins, claw clutch, etc._

GB/T 3077 30CrMo Alloy Steel Plate

CrMo  Chemical Composition_ _ _ Grade_ The Element Max (%)_ _ _ C_ Si_ Mn_ P_ S_ _ _ 30CrMo_ 0.26~0.34_ 0.17~0.37_ 0.40~0.70_ 0.035_ 0.035_ __30CrMo alloy steel plate Mechanical Property: __ _ Grade_ _ 30CrMo  Mechanical Property_ _ _ Thickness_ Yield_ Tensile_ HB_ _ _ 30CrMo_ mm_ Min Mpa_ Mpa_ HB_ _ _ 6-50_ 785_ 930_ _ _ _ 50-200_ 785_ 930_ _ __GB/T 3077 30CrMo covers the following issues of hot rolled and forging alloy steel: the dimension, shape, weight, tolerance, engineering specification, test method, inspection rules, packaging, marking, and quality certificates.__ The standard applies to alloy structural steel bar 250mm maximum diameter or thickness. After consultation between the two sides of supply and demand, bar stock of diameter greater than 250 mm can also be provided.__

GB/T 3077 35CrMo Alloy Steel Plate

is good. The working temperature is up to 500 ° C, the low temperature can be -100 ° C, and has high static strength and high fatigue strength, good hardenability, no tendency to overheat, small quenching deformation, and moderate machinability. However, this material has a first type of temper brittleness, and the weldability is not good. It needs to be preheated to 150-400 ° C before welding, and heat treatment is needed after welding to eliminate stress. Generally used after quenching and tempering treatment._35CrMo Steel Chemical Composition (%):__ _ Steel Grade_ C_ Si_ Mn_ P_ S_ Cr_ Mo_ Cu_ _ _ 35CrMo_ 0.32 to 0.40_ 0.17 to 0.37_ 0.40 to 0.70_ ≤ 0.030_ ≤ 0.030_ 0.80 to 1.10_ 0.15 to 0.25_ ≤ 0.30_ __35CrMo Alloy Steel Mechanical Properties:__ _ Grade_ Thickness_ Yield_ Tensile_ _ _ 35CrMo_ mm_ Min Mpa_ Mpa_ _ _ 6-50_ 835_ 980_ _ _ 50-200_ 835_ 980_ __Applications of 35CrMo Alloy Steel:_ 35CrMo alloy steel can be used to manufacture major parts in various machines that withstand impact, bending and high loads, such as rolling mill gears, crankshafts, connecting rods, fasteners, automotive engine spindles, axles, engine transmission parts, large motor shafts, bolts for boilers with operating temperatures below 400 °C, nuts below 510 °C, high pressure seamless thick-walled conduits for chemical machinery (450-500 ° C, non-corrosive media)._Equivalent:_ 35CrMo equivalent to US ASTM, European Germany DIN EN, British BS EN, France NF EN, Japanese JIS, and ISO standard._

GB T-3077 40Cr Steel Plate-Alloy Steel Coil and Plate

m-60mm_ Length: 5.8m 6m 9m 12m_40Cr Steel Chemical Composition:__ _ Grade_ C _ Si _ Mn _ S _ P _ Cr _ Ni _ Cu _ Mo _ _ _ 40Cr _ 0.37-0.44 _ 0.17-0.37 _ 0.50-0.80 _ ≤0.035 _ ≤0.035 _ 0.80-1.10 _ ≤0.30 _ ≤0.30 _ ≤0.15 _ __40Cr Steel Application: _ Used in making gear, the sleeve, spindle, crankshaft, spindles, pins, rods, screws, nuts, inlet valve.__

GB/T 3077 42CrMo steel plate

0.38～0.25_ Si(％)_ ≤0.40_ Mn(％)_ 0.60～0.90_ P(％)_ ≤0.035_ _ _ S(％)_ ≤0.035_ Cr(％)_ 0.90～1.20_ Mo(%)_ 0.15～0.30_ _ _ _ __42CrMo Mechanical Property: __ _ Grade_ Thickness_ Yield_ Tensile_ HB_ _ _ 42CrMo_ mm_ Min Mpa_ Mpa_ HB_ _ _ 6-50_ 930_ 1080_ _ _ _ 50-200_ 930_ 1080_ _ __GB T-3077 42CRMO standard applies to manufacture of bearing ring steel pipe rolling elements made by high-carbon chromium bearing steel processed with hot rolled forged round, steel wire, cold rolled.__

GB/T 3077 42CrMo4 alloy steel

GB/T 3077 50CrMo4 Alloy Steel Plate

enum._50CrMo4 steel with a particular composition are dedicated for vehicles and machines that require high hardness and are subject to strong bending, twisting, abrasion and wear loads._Chemical composition (%) of steel 50CrMo4:__ _ C_ Si _ Mn _ P _ S _ Cr _ Mo _ _ _ 0.46 - 0.54 _ max   0.4 _ 0.5 - 0.8 _ max   0.025 _ max   0.035 _ 0.9 - 1.2 _ 0.15 - 0.3 _ __GB/T 3077 50CrMo4 Mechanical properties:__ _ Yield_ Rp0.2 (MPa)_ Tensile_ Rm (MPa)_ Impact_ KV/Ku (J)_ Elongation_ A (%)_ _ _ 182 (≥)_ 769 (≥)_ 44_ 32_ __GB/T 3077 50CrMo4 steel application:_ 50CrMo4 steel is used as semi-finished products for the manufacture of components such as crankshafts, cogwheels, heavy-duty axles, gears, valves, heavy-duty screws, thrust rollers, guides, articulated joints, thrust rings, bolts or bushes.__

EN 10083-3 51CrV4 High Alloy Steel Plate

n._EN 10083-3 51CrV4 Chemical Composition (%):__ _ C_ Si _ Mn _ P _ S _ Cr _ V _ _ _ 0.47 - 0.55 _ max   0.4 _ 0.7 - 1.1 _ max   0.025 _ max   0.025 _ 0.9 - 1.2 _ 0.1 - 0.25 _ __EN 10083-3 51CrV4 Mechanical Property:__ _ _ Grade _ Mechanical Property_ _ _ _ Yield Strength(MPa)_ Tensile Strength(MPa)_ % Elongation min_ _ _ EN10083-3 51CrV4_ 900_ 1100-1300_ 12_ __Additional Condition:_ UT (Ultrasonic examination),AR(As Hot Rolled only),TMCP(Thermal Mechanical Control Processing),N(Normalized),Q+T(Quenched and Tempered),Z Direction Test(Z15,Z25,Z35) ,Charpy V-Notch Impact Test, HIC test, NDT ,PWHT( Simulated Post Weld Heat Treatment),NACE0175,The Third Party Test (Such as SGS Test), Coated or Shot Blasting and Painting.__