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EN 1.0503 Material C45 Steel Equivalent, Properties, Composition

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EN 1.0503 Material C45 Steel

EN 10083-2 C45 steel (EN 1.0503) is a high strength medium carbon quality steel. Due to poor hardenability, C45 material is generally used in a normalized condition, and when the mechanical properties are required to be high, the quenching and tempering treatment is adopted. The cold deformation plasticity is medium, and the machinability of annealing and normalizing is better than that of quenching and tempering.


Material C45 (1.0503) is used to manufacture parts with high strength requirements, such as gears, shafts, piston pins, etc., and parts that are not very stressed, such as machined parts, forgings, stampings, bolts, nuts, and pipe joints.

C45 Material Datasheet & Specification

The table below gives the C45 steel datasheet including chemical composition, mechanical properties and heat treatment.

Chemical Composition

Datasheet 1, The following data sheet lists the C45 chemical composition based on casting analysis.

Chemical Composition, %
StandardSteel name (Steel number)CSi, ≤MnP, ≤S, ≤Cr, ≤Ni, ≤Mo, ≤Cr+Mo+Ni, ≤
EN 10083-2C45 (1.0503)0.42-0.500.400.50-0.800.0450.0450.400.400.100.63

C45 Steel Properties

Mechanical Properties

The following table gives the C45 steel mechanical properties such as tensile strength, yield strength and hardness in the quenched and tempered, and normalized conditions.

Yield Strength

Datasheet 2, Yield strength in different diameter and conditions.

Yield strength (MPa)
Steel (Steel number)MPa, ≥Diamter (d), Thickness (t) in mmConditions
C45 (1.0503)490d ≤ 16
t ≤ 8
Quenched and tempered (for the ruling section)
43016 < d ≤ 40
8 < t ≤ 20
37040 < d ≤ 100
20 < t ≤ 60
340d, t ≤ 16Normalized (for products)
30516 <d, t ≤ 100
275100 <d, t ≤ 250

Tensile strength

Datasheet 3, Tensile strength in different diameter and conditions.

Tensile strength (MPa)
Steel (Steel number)MpaDiamter (d), Thickness (t) in mmConditions
C45 (1.0503)700-850d ≤ 16
t ≤ 8
Quenched and tempered (for the ruling section)
650- 80016 < d ≤ 40
8 < t ≤ 20
630-78040 < d ≤ 100
20 < t ≤ 60
≥ 620d, t ≤ 16Normalized (for products)
≥ 58016 <d, t ≤ 100
≥ 560100 <d, t ≤ 250


Datasheet 4, Minimum percentage elongation after fracture.

Steel (Steel number)≥, %Diamter (d), Thickness (t) in mmConditions
C45 (1.0503)14d ≤ 16
t ≤ 8
Quenched and tempered (for the ruling section)
1616 < d ≤ 40
8 < t ≤ 20
1740 < d ≤ 100
20 < t ≤ 60
14d, t ≤ 16Normalized (for products)
1616 <d, t ≤ 100
16100 <d, t ≤ 250


Datasheet 5, Minimum percentage reduction in cross section on fracture in the quenched and tempered condition.

Reduction in cross section (≥, %); Diamter (d), Thickness (t) in mm
Steel (Steel number)d ≤ 16
t ≤ 8
16 < d ≤ 40
8 < t ≤ 20
40 < d ≤ 100
20 < t ≤ 60
C45 (1.0503)354045


Datasheet 6, Products in the “treated to improve shearability” or “soft annealed” condition

Hardness in different conditions
StandardSteel name (Steel number)(HBW)Condition
EN 10083-2C45 (1.0503)255Treated to improve shearability
207soft annealed


Since material 1.0503 has a medium carbon content, it needs to preheat before welding, and the C45 material preheating temperature is 150 to 250 °C.

After welding, it’s better subjected to stress relief immediately, especially for large thickness weldments, the tempering temperature for stress relief is 550-660 °C.

Heat Treatment for Guidance

The heat treatment for C45 steel is mainly include quenching, tempering, normalizing and austenitizing, etc.


The quenching temperature is 820-860 ℃, quenching agent is water (temperatures at the lower end of the range) or oil (upper end of temperatures). Guidance for austenitizing period is at least 30 min.


The guidance for tempering temperature is 550-660 ℃, tempering period is at least 60 min.


The guidance for normalizing temperature is 840-900 ℃.

Isothermal Transformation Diagram

The image below shows C45 steel Isothermal Transformation Diagram (also known as Time Temperature Transformation, TTT) for reference.

C45 material Isothermal Transformation Diagram (Time Temperature Transformation, TTT)

C45 Material Equivalent Steel Grades

Datasheet 7, European standard (including Germany DIN, British BSI, French NF and other EU member state standards) C45 steel equivalent to Chinese GB standards, US ASTM AISI and SAE, Japanese JIS standards and ISO standards, etc.

C45 steel equivalent material
European UnionChineseUSJapaneseISO
StandardGrade (Steel number)StandardGradeStandardGradeStandardGradeStandardGrade
EN 10083-2C45 (1.0503)GB/T 69945 steelAISI SAE, ASTM A29/A29M1045 steelJIS G4051S45CC45E4

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