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65mn steel plate
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Details description
After heat treatment and cold drawing hardening, the strength is relatively high, and it has a certain degree of flexibility and plasticity; under the same surface condition and complete hardening, the fatigue limit is equivalent to the multicolored alloy spring. But the hardenability is very poor, and it is mainly used for small-sized springs, such as pressure regulating springs, force measuring springs, round and square spiral springs on general machinery, or drawn steel wires as springs on small machinery.
Featuresedit
Material name: spring steel
Grade: 65Mn
Standard: GB/T 1222-2007
●Characteristics and scope of application:
After heat treatment and cold drawing hardening, the strength is higher, and it has a certain degree of toughness and plasticity; under the same surface condition and complete hardening, the fatigue limit is equivalent to that of the alloy spring. However, the hardenability is poor, and it is mainly used for springs of smaller size, such as pressure regulating springs, force measuring springs, round and square spiral springs in general machinery or drawn into steel wires as springs on small machinery.
Chemical composition
●Chemical composition:
Carbon C: 0.62～0.70
Silicon Si: 0.17～0.37
Manganese Mn: 0.90～1.20
Sulfur S: ≤0.035
Phosphorus P: ≤0.035
Chromium Cr: ≤0.25
Nickel Ni: ≤0.25
Copper Cu: ≤0.25
Mechanical propertiesedit
Tensile strength Rb(MPa): 735
Yield strength Rs (MPa): 430
Elongation δ10 (%): 14~21.5
Reduction of area ψ (%): not less than 10
GB_T699-1999 (high quality carbon structural steel)
Hardnessedit
Hot rolling hardness: 240~270HB
Cold rolled soft hardness: 190~220HB
Hardness of cold rolling: 300~340HB
Heat treatment hardness: 38~60HRC
Heat treatmentedit
Heat treatment and specifications
Quenching 830℃±20℃, oil cooling; tempering 540℃±50℃ (for special needs, ±30℃).
Critical point temperature (approximate value) Ac1=726℃, Ac3=765℃, Ar3=741℃, Ar1=689℃, Ms=270℃.
Normalizing specification: temperature 810±10℃, air cooling.
Quenching and tempering specifications: quenching temperature 830±10℃, oil cooling; tempering temperature 540℃±10℃, water and oil cooling.
delivery status
Hot-rolled steel is delivered in a heat-treated or non-heat-treated state, and cold-drawn steel is delivered in a heat-treated state. (2.0-16)*1250*C Laiwu Steel/Hot Coil/Hot Plate
50Mn (2.0-16)*1250*C Laiwu Steel/Hot Coil/Hot Plate
65Mn (2.0-16)*1010/1250*C Laiwu Steel/Hot Coil/Hot Plate
Weight calculationedit
Plate: length (M) * width (M) * thickness (mm) * density = KG
Bar: radius*radius*3.14*high*density/1000000=KG
Annealing specificationedit
Traditional periodic spheroidizing annealing process, annealing temperature is 750℃, holding for 2h, furnace cooling to temperature (680±10)℃, holding for 3h, then furnace cooling to 550℃, and then air cooling. The production efficiency is low, the oxidation decarburization rate reaches 22%-40%, and the surface hardness and elasticity are not up to the requirements. New process of incomplete annealing, annealing temperature (740±10) ℃, heat preservation for 4 hours, after the furnace is cooled to 550 ℃, air cooling is released. The tensile strength is 600-620Mpa, the elongation is 53.5%-40%, and the hardness is 209-214HBW. The metallographic structure is spheroidized pearlite + a small amount of point pearlite, which shortens the production cycle and saves energy.
New annealing processedit
In the traditional annealing process, the annealing temperature is 730℃, the temperature is kept for 13h, and after the furnace is cooled to 650℃, the furnace is air cooled. New annealing process: annealing temperature (860±10) ℃, holding for 45-60min, furnace cooling to (750±10) ℃, holding for 3-3.5h, after the furnace is cooled to 650-660 ℃, out of the furnace or into the heat preservation The pit is slowly cold. The metallographic structure meets the requirements: the pearlite structure is 2.5-6 grades, preferably about 4 grades. The process improves the efficiency by 80%-100%.
Heat treatmentedit
65Mn low-alloy round steel must have high elastic limit and high yield ratio to avoid permanent deformation of spring steel under high load; at the same time, it also requires good hardenability and low decarburization sensitivity to make elastic The limit is greatly reduced; as well as good surface quality, easy processing and forming in cold and hot conditions and good heat treatment processability.
Heat treatment process of hot-formed spring steel formed in a hot state. Most of the spring steel formed by this method is a combination of hot forming and heat treatment, while most of the coil spring steel is heat treated after hot forming. The heat treatment method of this kind of spring steel is quenching + tempering at intermediate temperature, and the structure after heat treatment is tempered troostite. This kind of organization has high elastic limit and yield limit, and has certain toughness.
Adopt brand-new concepts and methods, and innovatively develop stability control technology. Carefully analyze the formation mechanism of "rolling, tail-flicking" and other problems that are most likely to occur in this "0.4 second" time, so as to reduce roll damage , Reduce tail deviation and other aspects of work, after more than 3 years of software program development, tracking test, evaluation, analysis to determine reasonable process parameters.
65Mn steel plate has higher strength, hardness, elasticity and hardenability than 65 steel, and has a tendency to overheat sensitivity and temper brittleness. Water quenching has a tendency to form cracks. Machinability in annealed state is acceptable, cold deformation plasticity is low, and weldability is poor. Medium-loaded leaf springs, coil springs with a diameter of 7-20mm and spring washers. Spring rings. Parts with high wear resistance, such as grinding machine spindles, spring chucks, precision machine tool screws, cutters, collars on spiral roller bearings, railway rails, etc.
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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Email : cmgc@sdcmsteel.cn
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