1050 Carbon Steel

One. Product Description

1050 Carbon Structural Steel is a high-strength medium carbon steel, also known as 50 steel in the industry. 50 steel is a common material for shaft parts. It is cheap, has better cutting performance after quenching and tempering (or normalizing), and can obtain higher comprehensive mechanical properties such as strength and toughness. The surface hardness after quenching can reach 45-52 HRC.

Two. Quality Standard

ASTM A29/A29M-04 Standard Specification

Three. Product Specifications

Four. Equivalent Grade of 1050 Carbon Steel  - For Reference Only

Five. Product Features and Uses

Features:

1. Medium carbon high strength carbon structural steel, high strength and hardness after quenching.

2. The steel has medium cutting performance, low cold deformation plasticity and poor weldability.

3. No temper brittleness during heat treatment, but low hardenability. The critical diameter in water is 13*30mm, and there is a tendency to crack during water quenching. This steel is usually used after heat treatment such as normalizing or quenching and tempering or high-frequency surface quenching.

Use:

Manufacture of mechanical parts with low dynamic load, low impact load and good wear resistance, such as forged gears, shaft friction discs, machine tool spindles, engine spindles, rolls, tie rods, spring washers, etc.

Six. Product Detailed Information

50 carbon structural steel is a high-strength medium carbon steel, also known as 50 steel in the industry. After treatment, it has high surface hardness and strength, and is used to manufacture parts with high requirements on wear resistance and small dynamic load and impact force. Such as casting gears, tie rods, rollers, etc.; manufacturing smaller springs, digging plows on agricultural machinery, heavy mandrels and shafts, etc., manufacturing castings. 50 carbon structural steel has slightly poor plasticity and toughness, excellent cutting performance, general weldability and hardenability, and easy to form cracks during water quenching. Generally, the effect is better after normalizing or quenching, and it is mainly used for parts that require strength and wear resistance, elasticity and small dynamic load and impact load, such as gears, rims, leaf springs, crankshafts, etc.

Processing:

1. The blanks of shaft parts Shaft parts can be selected in the form of bars, forgings and other blanks according to the use requirements, production types, equipment conditions and structures. For shafts with little difference in outer diameter, bars are generally used; for stepped shafts or important shafts with large differences in outer diameter, forgings are often used, which not only saves materials but also reduces processing workload. To improve mechanical properties, according to different production scales, there are two kinds of blank forging methods: free forging and mold forging. Free forging is mostly used for small and medium batch production, and mold forging is used for mass production.

2. Shaft parts materials Shaft parts should choose different materials according to different working conditions and use requirements, and adopt different heat treatment specifications (such as quenching and tempering, normalizing, quenching, etc.) to obtain certain strength, toughness and resistance. . Abrasive.

50 steel is a common material for shaft parts. After quenching and tempering (or normalizing) treatment at a low price, better cutting performance can be obtained, and comprehensive mechanical properties such as high strength and high toughness can be obtained. The surface hardness can be increased after quenching. Up to 45 ~ 52HRC. Unquenched surface hardness is 28-32HRC, 40Cr and other alloy structural steels are suitable for shaft parts with medium precision and high speed. These steels have good comprehensive mechanical properties after quenching, tempering and quenching.

Bearing steel GCr15 and spring steel 65Mn, after quenching and tempering and surface high frequency quenching, the surface hardness can reach 50-58HRC, which has high fatigue resistance and good wear resistance, and can manufacture high-precision shafts.

38CrMoAIA nitrided steel can be selected for the spindle of precision machine tools (such as grinding wheel shaft of grinding machine and spindle of coordinate boring machine). After quenching and tempering and surface nitriding, this steel can not only obtain high surface hardness, but also maintain a soft core, so it has good impact toughness. Compared with carburized and quenched steel, it has the characteristics of small heat treatment deformation and high hardness.

No. 50 steel is widely used in machinery manufacturing, and the mechanical properties of this steel are very good. But this is medium carbon steel, and the quenching performance is not good. No. 50 steel can be hardened to HRC42~46. Therefore, if the surface hardness is required, and the No. 50 steel is required to have superior mechanical properties, the surface of the No. 50 steel is often carburized and quenched to obtain the required surface hardness.

Mechanical Behavior

Tensile strength σb (MPa): ≥630 (64)

Yield strength σs (MPa): ≥375 (38)

Elongation δ5 (%): ≥14

Area shrinkage ψ (%): ≥40

Impact energy Akv (J): ≥31 (4)

Impact toughness value αkv (J/cm²): ≥39 (4)

Hardness: unheated, ≤241HB; annealed steel, ≤207HB

Sample size: sample size is 25mm

German DIN steel standard: Cf53
Chinese steel GB standard: 50
BS British Steel Standard: 060A52
French AFNOR steel standard: XC48TS
French Steel Standard NF: C50
Italian UNI steel standard: C53
Belgium NBN steel standard: C53
Swedish SS Steel Standard: 1674
AISI/SAE/ASTM American Steel Standard: 1050
Japan JIS steel standard: S50C/S53C
International Organization for Standardization (ISO) Steel Standard: C50E4

Critical point temperature (approximate value) Ac1=725℃, Ac3=760℃, Ar3=721℃, Ar1=690℃

Normalizing specification: temperature 830℃±10℃, air cooling.

Quenching and tempering: the general specification is quenching temperature of 830℃±10℃, water cooling, oil cooling; tempering temperature is 600℃±10℃, water cooling and oil cooling.

Scope of Application

Manufacture of mechanical parts with low dynamic load and impact load requiring good wear resistance, such as forged gears, shaft friction discs, machine tool spindles, engine spindles, rolls, tie rods, spring washers, etc.

Characteristics and application = no heating: HB≤241

Heat treatment: normalizing

Impact energy: Aku≥31J

High strength, poor plasticity and toughness, medium machinability, poor weldability, and easy to form cracks during water quenching. Generally, it is normalized in the quenched and tempered state, and used as parts requiring high strength, wear resistance or elasticity, small dynamic load and impact load, such as gears, rolls, machine tool spindles, connecting rods, secondary springs, etc.