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45# hot rolled steel sheet

45# is a grade of steel, a high-quality carbon structural steel, corresponding to Japanese standard S45C, American standard: 1045, and German standard C45. Its characteristic is that it has higher strength and resistance to deformation than ordinary A3 steel.

Product introduction

The recommended heat treatment system for 45 steel specified in the GB/T699-1999 standard is normalizing at 850°C, quenching at 840°C, and tempering at 600°C. The achieved performance is yield strength ≥355MPa
The GB/T699-1999 standard stipulates that the tensile strength of 45 steel is 600MPa, the yield strength is 355MPa, the elongation rate is 16%, and the reduction of area is 40%.
No. 45 steel is widely used in machinery, when it is not heat treated: HB≤229; heat treatment: normalizing; impact energy: Aku≥39J; high strength, good plasticity and toughness, 45# steel plate after quenching without tempering, the hardness is greater than HRC55 (Up to HRC62) is qualified. After heat treatment and tempering, it can reach HRC42-46, which can not only ensure its good mechanical properties, but also obtain the hardness requirements of the surface. It is used to make small section adjustments that can withstand larger loads. Quality parts and large normalized parts with less stress, as well as surface hardened parts that do not require high core strength, such as tips, guide posts, watch hands and other components.

Material: forged square steel bar
Diameter: 100mm-1000mm
Length: 2000mm-12000mm Straightness: 3mm/M max;
square bar.100-1000mm, blocks sizes up to 800*1000mm
Process: EAF + LF + VD + Forged + Heat Treatment (optional)
Delivery condition: Hot forged +Rough machined (black surface after Q/T)+ Turned (optional)
Delivery Time: 30-45 days
MOQ: 20 tons
Heat treatment: Normalized / Annealed / Quenched / tempered
Forged ratio: no less than 3:1
Technical Data: According to the customer's requirement of Chemical Composition, Physical Properties and Mechanical Testing
Test: Ultrasonic test according to SEP 1921-84 G3 C/c
Marking: Grade, heat NO. length will be stamped one each bar with required color
Payment: 30% advance by TT; Balance pay before the shipment against shipping documents or irrevocable LC at sight
Application: Statically and dynamically stressed components for vehicles, engines and machines. For parts of larger cross-sections, crankshafts, gears.

Technical data

Grade Dia(mm) C Si Mn P S Ni Cu Cr
0.17-0.23 0.17-0.37 0.35-0.65 ≤0.035 ≤0.035 ≤0.30 ≤0.25 ≤0.25
45 20-600 0.42-0.50 0.17-0.37 0.35-0.65 ≤0.035 ≤0.035 ≤0.30 ≤0.25 ≤0.25

Mechanical properties

Yield strength σs/MPa (>=) Tensile strength σb/MPa (>=) Elongation
δ5/% (>=)
Reduction of
area ψ/% (>=)
Hardness HBS
≥355 ≥600 ≥16 ≥40 ≤197


Features of C45 steel

1, Medium carbon structural steel

2, High strength and machinability

3, Good toughness, plasticity and abrasion resistance

4, Typically used in quenched and tempered or normalized conditions

4,Typical Applications 

1, Widely used in machine manufacturing

2, For shaft parts  

3, Stamping die drawing parts repair and hardfacing

Keywords: 45# hot rolled steel sheet

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