Products

40CrNiMoA-DIN:36CRNIMO4 Alloy Round Steel Bar Krobo Steel

Product Name Carbon steel bar
Material 40CrNiMoA
Surface Treatment Black Painted, PE Coated, Galvanized or Customized all available
Size O.D: 8-480mm
W.T: 8-480mm
Length: 1-12m
Standard ASTM, DIN, GB, JIS, BS, AISI
Technique Hot Rolled
Payment terms L/C at sight or T/T (30% as deposit)
Packing Export standard package or as customers’ request
Samples Free samples are provided but the fright is borne by the buyer

Product Introduction

40CrNiMoA steel is a Chinese alloy steel, has high strength, toughness and good hardenability, and has anti-overheating stability, but has high white point sensitivity, temper brittleness and poor weldability. Preheating is required before welding, and stress relief treatment is required after welding.

Properties and Applications of 40CrNiMoA Alloy Steel:

40CrNiMoA steel is used after quenching and tempering, and is used to manufacture important parts requiring good plasticity, high strength and large size. For example, heavy-duty shafts in heavy-duty machines, steam turbine shafts with diameters greater than 250 mm, blades, transmissions, fasteners, crankshafts, gears, etc., can also be used for rotor shafts and blades operating at temperatures exceeding 400 °C.

Chemical Composition (%)

Steel Grade

C

Si

Mn

P

S

Cr

Ni

Cu

Mo

40CrNiMoA

0.37~0.44

0.17~0.37

0.50~0.80

Allowable residual content ≤0.025

Allowable residual content ≤0.025

0.60~0.90

1.25~1.65

Allowable residual content ≤0.025

0.15~0.25

40CrNiMoA Alloy Steel Mechanical Properties:

.Yield strength: ≥ 835 MPa

.Tensile strength: ≥ 980 MPa

.Elongation: ≥12%

.Rate of reduction in area: ≥55%

.Impact absorbing energy: ≥ 78 J

.Material Brinell Hardness: ≤ 269 (Annealed or high temperature tempered steel rod)

.Sample size: 25mm

 

40CrNiMoA heat treatment:

Heat treatment: (quenching 850 degrees; coolant: oil; tempering temperature 600 degrees; coolant: water, oil);

Steel annealing or high temperature tempering supply state Brinell hardness GBW≤269

Common quality defects of bearing parts after heat treatment are: overheating of the quenched microstructure, underheating, cracks in the quenched microstructure, insufficient hardness, deformation during heat treatment, surface decarbonization, soft spots, etc.

 

 

The main purpose of 40CrNiMoA:

High-strength parts such as aero-engine shafts, shafts, gears, fasteners, etc.

 

 

Why Choose Us?

*Top 20 companies in steel industry trade volume.

*Customized processing steel one-stop purchase.

*Exports of steel exceeded tens of billions for 5 consecutive years.

**We have a complete set of testing equipment, such as ut & ET, hydraulic testing equipment, spectrometer, scanning electron microscope, etc, and have passed SGS TUV

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