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List of main recommended steel strips by Jiaxiao MTC

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Material  Brands and standardschemical compositionCharacteristics and scope of application
40MnChinese grade: 40Mn Standard: GB/T 699-1988
American grade: 1040 Standard: ASTM A29\A29M-04
Japanese brand: SWRCH40K Standard: JIS G3507\1-2005
German grade: C40 Standard: EN 10083\2-1991
C: 0.37~0.45
Si: 0.17~0.37
Mn: 0.70~1.00
S: ≤0.035
P: ≤0.035
Cr: ≤0.25
Ni: ≤0.30
Cu: ≤0.25
It has good cutting performance, medium plasticity during cold deformation, and poor welding performance. Used to manufacture parts that bear fatigue loads, such as shaft rollers and screws and nuts that work under high stress.

The hardenability is slightly higher than 40 steel. After heat treatment, the strength, hardness and toughness are slightly higher than 40 steel, the cold deformation plasticity is medium, the machinability is good, the weldability is low, it has overheating sensitivity and temper brittleness, and it is easy to crack after water quenching. Suitable for fatigue-resistant parts, crankshafts, rollers, shafts and connecting rods.
45MnChinese grade: 45Mn Standard: GB/T699-1999
American grade: 1046 Standard: ASTM A29/ A29M-02
Japanese brand: SWRCH45K Standard: JIS G3507/1-2005
German grade: C45 Standard: EN 10083/2-1991
C: 0.42~0.50
Si: 0.17~0.37
Mn: 0.70~1.00
S: ≤0.035
P: ≤0.035
Cr: ≤0.25
Ni: ≤0.25
Cu: ≤0.25
This is a new steel type that has successfully replaced 40Cr steel. It has high strength, hardness, wear resistance and good toughness. Its hardenability is slightly higher than that of 40Cr. The critical hardenable diameter in oil reaches 18~ 33mm; the machinability is good after normalizing, and the process performance of cold drawing, thread rolling, tapping and forging, and heat treatment are also good. The tendency of grain growth, oxidation, decarburization and quenching deformation at high temperature is small; but It has temper brittleness and its tempering stability is slightly worse than 40Cr steel. [Application Example] This steel is generally used in a quenched and tempered state, with a service temperature range of -20~425°C. It is mainly used to replace 40Cr steel in the production of medium and small-section quenched and tempered parts, such as automobile axles, steering shafts, worms, and splines. Shafts and machine tool spindles, gears, etc. In addition, it can also replace 40Cr steel to produce parts with larger cross-sections such as Φ250~320mm winch intermediate shafts. This steel can also be used instead of 40CrNi steel when making smaller parts.

Used to manufacture parts subject to wear, such as rotating shafts, spindles, crankshafts, splined shafts, connecting rods, universal joint shafts, meshing rods, gears, clutch plates, bolts, nuts, etc.
45#Chinese brand: 45#
American grade: 1045
Japanese brand: S45C
German brand: C45
C: 0.42~0.50;
Cr: ≤0.25;
Mn: 0.50~0.80;
Ni: ≤0.25;
P: ≤0.035;
S: ≤0.035;
Si: 0.17~0.37
No. 45 steel is widely used in machinery. When not heat treated: HB ≤ 229; heat treatment: normalizing; impact power: Aku ≥ 39J; high strength, good plasticity and toughness. After quenching and before tempering, the hardness of the 45# steel plate is greater than HRC55 (Up to HRC62) To be qualified, it can reach HRC42-46 after heat treatment and tempering, which can not only ensure its good mechanical properties, but also obtain the surface hardness requirements.

It is used to make small-section quenched and tempered parts that bear large loads and large normalized parts with small stress, as well as surface-hardened parts that do not require high core strength, such as tips, guide posts, watch hands and other parts.
50#Chinese brand: 50#
American grade: 1050
Japanese brand: S50C/S53C
German brand: C50
C: 0.47-0.55
Si: 0.17-0.37
Mn: 0.5-0.80
P: ≤0.035
S: ≤0.035
Ni: ≤0.30
Cr:≤0.15
Cu:≤0.25
This steel has medium machinability, low cold deformation plasticity, poor weldability, no temper brittleness during heat treatment, but low hardenability, with a critical diameter in water of 13-30mm, and a tendency to crack during water quenching. This steel is usually used after heat treatment such as normalizing, quenching and tempering, or high-frequency surface quenching.

Manufacture of mechanical parts with low dynamic load and impact load and requiring good wear resistance, such as forged gears, shaft friction discs, machine tool spindles, engine spindles, rollers, tie rods, spring washers, etc.
Characteristics and applications = Without heat treatment: HB ≤ 241; Heat treatment: normalizing; Impact power: Aku ≥ 31J; High strength, poor plasticity and toughness, medium machinability, poor weldability, and a tendency to form cracks during water quenching. Generally used in normalizing and quenching and tempering conditions, for parts requiring higher strength, wear resistance or elasticity, and small dynamic load and impact load, such as gears, rollers, machine tool spindles, connecting rods, secondary springs, etc.

1. When used to manufacture general punches, the batch size is less than 1,000 pieces, the material to be punched is soft low carbon steel plate, the thickness is ≤1mm, and the die used is zinc-based alloy.
2. Suitable for manufacturing mold parts with high wear resistance requirements, large dynamic load and impact.
55#Chinese brand: 55#
American grade: 1055
Japanese brand: S55C
German brand: C55
C: 0.52~0.60″
Si: 0.17~0.37
Mn: 0.50~0.80
S: ≤0.035
P: ≤0.035
Cr: ≤0.25
Ni: ≤0.30
Cu: ≤0.25
55 steel is a high-strength medium-carbon steel. It has high surface hardness and strength after treatment, but has poor plasticity and toughness, medium cutting performance, poor weldability and hardenability, and water quenching has a tendency to form cracks. 55 steel is generally used after normalizing or quenching. It is used for parts that require high strength and wear resistance or elasticity, dynamic load and small impact load, such as gears, rims, flat springs, crankshafts, etc. It can also be used as casting.

The functions, structural characteristics and technical requirements of shaft parts.

Shaft parts are one of the typical parts often encountered in machines. It is mainly used to support the transmission zero.
60#Chinese brand: 60#
American grade: 1060
Japanese brand: S58C
German brand: C60
C: 0.57~0.65
Si: 0.17~0.37
Mn: 0.50~0.80
S: ≤0.035
P: ≤0.035
Cr: ≤0.25
Ni: ≤0.25
Cu: ≤0.25
No. 60 steel is a hypoeutectoid steel with high strength, hardness and elasticity. It has low plasticity during cold deformation, poor machinability, poor welding and hardenability, and water quenching has a tendency to produce cracks. Large parts are mostly normalized. . No. 60 steel is used to manufacture shafts, spring rings, axles, various washers, cams, steel ropes and other parts that are subject to large forces, work under friction conditions, and require high strength, wear resistance and a certain elasticity.
65MnChinese brand: 65Mn
American grade: 1065
Japanese brand:S65C
German brand: C67
C: 0.62~0.70
Si: 0.17~0.37
Mn: 0.90~1.20
S: ≤0.035
P: ≤0.035
Cr: ≤0.25
Ni: ≤0.30
Commonly used spring steel, the final heat treatment is quenching and tempering. This steel has high strength, large hardenability, and low decarburization tendency, but it is sensitive to overheating, prone to quenching cracks, and has tempering hardenability. In the annealed state, the machinability is good, the weldability is good, the cold deformation plasticity is low, and the strip can be processed by general bending and forming.

It is used for various small-sized flat and round springs, seat springs, and spring springs. It can also be used to make spring rings, valve springs, clutch reeds, brake springs, and cold-drawn steel wire cold-rolled coil springs.
75#Chinese brand: 75#
American brand: 1074
Japanese brand:
German brand: C75
C:0.72~0.80,
Mn:0.50~0.80,
Ni:≤0.30,
Si:0.17~0.37
P:≤0.035,
S:≤0.035
Cr:≤0.25
Cu:≤0.25
The performance of No. 75 steel is similar to that of No. 65 steel. Its elasticity is slightly worse than that of No. 65 steel. It has higher strength and lower hardenability. It is generally used in the quenched and tempered state. Used to manufacture coil springs, leaf springs, and worn mechanical parts with low strength and slightly smaller cross-section size.

①Alloy structural steel is widely used in pistons, screws, transmission shafts, machine tools, and structures such as push plates, lock wedges, die sleeves, reset rods, larger diameter push rods, and core fixing plates for manufacturing injection molds. Alloy structural steel has better mechanical properties than carbon steel, especially excellent heat treatment properties.
② Mechanical transmissions such as belt drive, friction wheel drive, key drive, harmonic drive, gear drive, rope drive and screw drive that transmit motion and energy, as well as couplings, clutches and brakes
SK85Chinese grade: T8 (A) /T9 (A) steel
American ASTM grades: W1-71/2 and W1-81/2
United States UNS brand: T72301
Japanese brand: SK85
German brand: C80W1
C:0.80% ~0.90%
Si≤0.35%
Mn≤0.50%
P≤0.03%
S≤0.03%
Cr≤0.20%
Ni≤0.25%
Cu≤0.30%
SK85 steel is Japanese high-grade carbon tool steel and cold work die steel. It is a high-carbon steel with a carbon mass fraction of more than 0.80%. After quenching, the hardness is 50~60HRC. This steel has high hardness, excellent wear resistance, and is easy to Obtain spheroidization.

1) Used for mold parts that require high hardness and wear resistance due to sliding friction, such as guide pins, bushings, and ejector pins.
2) Cutting tools, cold heading dies, scrapers and files for processing wood.
51CrV4Chinese brand: 51CrV4
American brand: G61500
Japanese brand: SUP10
German grade: 51CrV4
C: 0.47~0.55
Si: ≤0.40
Mn: 0.70~1.10
S: ≤0.030
P: ≤0.030
Cr: 0.90~1.20
Ni: ≤0.35
Cu: ≤0.25
V: 0.10~0.25
51CrV4 (1.8159) spring steel has good mechanical properties and process properties, and high hardenability. Adding vanadium refines the grains of the steel, reduces overheating sensitivity, improves strength and toughness, has high fatigue strength, and has a low yield ratio. High, but poor weldability and low plasticity due to cold deformation.

51CrV4 is a higher-grade spring, used as important springs with large cross-section and high load, as well as valve springs, piston springs, and safety valve springs with operating temperatures <300°C.
75Cr1 75Cr1 is the foreign standard cold work tool steel grade, which is equivalent to the German grade 1.2003. The foreign standard cold work tool steel grade, the German grade 1.2003 is equivalent to the domestic grade T8Cr.C: 0.2~0.78%
Si: 0.25~0.50%
Mn:0.5~0.8%
Cr: 0.3~0.4%
P≤0.035%
S≤0.035%
Cold work die steel focuses on hardness and wear resistance. The carbon content is high, and the alloying elements mainly increase the hardenability and wear resistance.

Small tools such as: mandrels, punches, tamping tools, razors.
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