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Q235 Q345 1020 1040 A36 Sk85 St37 Ss400 S235jr Mild Hot Rolled Metal Ms Sheet Low Carbon Steel Plate
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Details description
40Cr is my country's GB standard steel grade, and 40Cr steel is one of the most widely used steels in the machinery manufacturing industry. After quenching and tempering, it has good comprehensive mechanical properties, good low temperature impact toughness and low notch sensitivity. The hardenability of steel is good. It can be hardened to Ф28～60mm in water quenching and Ф15～40mm in oil quenching. In addition to quenching and tempering, this steel is also suitable for cyanidation and induction hardening. The cutting performance is better. When the hardness is 174～229HB, the relative machinability is 60%. The steel is suitable for making medium-sized plastic molds.
Basic informationedit
According to the standard GB/T 3077-2015 and GB/T 17107-1997, steel plate GB/T11251-2009 and Wuyang enterprise standard
Corresponding to foreign standards:
JIS (Japan): SCr440;
ASTM (United States): 5140;
ISO: 41Cr4.
chemical composition
C: 0.37~0.44
Si: 0.17~0.37
Mn:0.50~0.80
Cr: 0.80~1.10
Ni: ≤0.30
P:≤0.035
S: ≤0.035
Cu: ≤0.030
Mo:≤0.10
Mechanical properties
Sample blank size (mm): 25
Heat treatment:
The first quenching heating temperature (℃): 850; coolant: oil
The second quenching heating temperature (℃):-
Tempering heating temperature (℃): 520;
Tensile strength (σb/MPa): ≥810 (when actual hardness is 25HRC)
Yield point (σs/MPa): ≥785
Elongation after breaking (δ5/%): ≥9
Reduction of area (ψ/%): ≥45
Impact absorption (Aku2/J): ≥47
Brinell hardness (100/3000HBW) (annealed or high temperature tempered state): ≤207
40cr introductionedit
The standard steel grade of GB in my country is 40Cr;
German DIN standard material number 1.7035/1.7045, German DIN standard steel number 41Cr4/42Gr4;
British EN standard steel number 18, British BS standard steel number 41Cr4;
French AFNOR standard steel number 42C4, French NF standard steel number 38Cr4/41Cr4;
Italy UNI standard steel grade 41Cr4;
Belgium NBN standard steel grade 42Cr4;
Swedish SS standard steel number 2245;
American AISI/SAE/ASTM standard steel number 5140;
Japanese JIS standard steel number SCr440(H)/SCr440;
The International Organization for Standardization ISO standard steel number 41Cr4.
【Critical point temperature】
(Approximate value) Ac3=780℃
【Normalizing Specifications】
Temperature 850~870℃, hardness 179~229HBW.
[Code for softening treatment of cold pressed blanks]
The temperature is 740~760℃, the holding time is 4~6h, and then the temperature is lowered to ≤600℃ at a cooling rate of 5~10℃/h, and the furnace is air cooled.
The hardness before treatment is ≤217HBW, and the hardness after softening is ≤163HBW.
[Pig iron chip protection swing tempering specification]
(670±10)℃×2h, heating with the furnace, (710±10)℃×2h, cooling with the furnace;
(670±10)℃×2h, heating with furnace, (710±10)℃×2h, then cooling with furnace;
(670±10)℃×2h, heating with the furnace, (710±10)℃×2h, cooling with the furnace;
A total of 3 cycles, and then cooling to 550 ℃, air cooling out of the furnace. The hardness after treatment is 153HBW.
[Specifications for tempering treatment]
The quenching temperature is 850℃±10℃, oil cooling; the tempering temperature is 520℃±10℃, water, oil and air cooling.
Quenched and tempered hardnessedit
The hardness after 40Cr quenching and tempering is about 32-36HRC, that is to say, about 301-340HB.
40Cr--830-860℃ Oil quenching-->55HRC
Tempering at 150℃--55HRC
Tempering at 200℃--53HRC
Tempering at 300℃--51HRC
Tempering at 400℃--43HRC
Tempering at 500℃--34HRC
Tempering at 550℃--32HRC
Tempering at 600℃-28HRC
Tempering at 650℃-24HRC
700℃ Tempering-20HRC
Featuresedit
characteristic
Medium carbon quenched and tempered steel, cold heading die steel. The steel is moderately priced and easy to process. After proper heat treatment, certain toughness, plasticity and wear resistance can be obtained. Normalizing can promote the refinement of the structure, close to the equilibrium state, and improve the cutting performance of the blank. Tempering at a temperature of 550~570℃, the steel has the best comprehensive mechanical properties. The hardenability of this steel is higher than that of 45 steel, and it is suitable for surface hardening treatments such as high-frequency quenching and flame quenching.
use
After quenching and tempering, this kind of steel is used to manufacture mechanical parts under medium load and medium speed, such as car steering knuckles, rear half shafts and gears, shafts, worms, spline shafts, top sleeves on machine tools, etc.;
After being quenched and tempered at medium temperature, it is used to manufacture parts that are subjected to high load, impact and medium speed work, such as gears, main shafts, oil pump rotors, sliders, collars, etc.;
After quenching and low-temperature tempering, it is used to manufacture parts with heavy load, low impact and wear resistance, and the solid thickness on the section is below 25mm, such as worms, spindles, shafts, collars, etc.;
After quenching and tempering and high-frequency surface quenching, it is used to manufacture parts with high surface hardness and wear resistance without great impact, such as gears, sleeves, shafts, main shafts, crankshafts, spindles, pins, connecting rods, Screws, nuts, intake valves, etc.
In addition, this kind of steel is suitable for manufacturing various transmission parts that undergo carbonitriding treatment, such as gears and shafts with larger diameters and good low temperature toughness.
【Delivery status and hardness】
Annealed state, hardness ≤207HBW.
Factory appearance
Packing & Delivery
Our Company
Shandong Chengming Steel Co.,Ltd
Our company supplies cold/hot-rolled stainless steel sheets,stainless steel bars ,stainless steel coil stainless steel pipes,lead plate,bearing steel,spring steel,steel plate pile,tank plate,alloy steel plate,weather resistant steel plate and wear resistant plate to many steel factories from at home and abroad, including Shanxi Taigang Iron& Steel CO,.LTD (TISCO) Zhangjiagang Pohang (ZPSS), Shanghai Krupp, Ningbo Baoxin and steel factories in Taiwan area, Mainland Chinese and foreign countries and regions.
Our annual capacity is 25, 000 tons. The Annual Domestic Sale is 20 million, Annual Exported Sale about 12 million dollars.Our products supplied to more than 20 countries, such as Indonesia, Spain, Japan, Korea, Vietnam, Italy, Israel,Australia, Malaysia, Brazil, Pakistan, U. A. E, Peru, India etc. Good quality has been getting more and more prise from buyers at home and abroad.Our long-term business lines are 304 .202, 201 .430.409L, 304L, 316L, 309S and 310S, Finish: 2B ,BA ,NO.1 NO.4 ,HL, NO.8 and so on . For the sheets and coils,the thickness ranging from 0.3mm to 100mm.For the bars,the diameter ranging from 1mm to 300mm.For the pipes ,we have seamless pipe and weld pipe. Meanwhile, our company is also engaged in the long-term supply of homemade & imported medium and thick plates,galvanized or carbon
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Stainless steel round steel belongs to the category of long products and bars. The so-called stainless steel round steel refers to a long product with a uniform circular cross section
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