40# round bars

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11-May-2024

40# Hot rolled steel bar, 40# Forged steel bar 40# is under JIS 4051 standard
40# features 1.good hardness 2.good toughness 3.good plasticity 4.good strength
Common size for steel bar:
Common diameter for hot rolled steel bar: 8mm to 70mm
Common diameter for forged steel bar: 80mm to 1200mm
Package: standard seaworthy packing or as customer required

Tolerance for the steel bar:
Diameter tolerance: 0~3mm， Length tolerance：0~20mm
Straightness: 3mm/1000mm

Delivery condition for 40# steel bar:
Hot forged +Normalized+rough turned Q/T:Quench+ Temper Annealing

EAF ARC FURNACE + LF REFINING+ VD + FORGING (DOUBLE) + FIXED LENGTH + SEP1921C/c TESTING

40# Chemical composition

Grade	C	Si	Mn	P	S	Cr	Ni	Cu
40#	0.37～0.45	0.17～0.37	0.50～0.80	≤0.030	≤0.035	≤0.25	≤0.25	≤0.25

40# Mechanical property

Grade	Tensile strength	Yield strength	Elongation	Impact value
Grade	σb (MPa) Min	σb (MPa) Min	δ5 (%)Min	Akv (J)Min
39CrNiMo3	570(58)	335(34)	19	47

Application
Application:used for the production of various types of steel rivet, bolt, welding structural parts. As for the good ware resistance surface, 40# can be used for machine parts, such as roller, shaft, connecting rod, disc, the axle of the train, can also be used for cold wire drawing, steel plate, steel strip, seamless tube, etc

KUNFENG Co.,ltd is professional in steel bar. We are a large stockist of steel bar in China. We have almost 750 ton steel bar of 40# in stock. The stock size ranges from Φ80 to Φ700. The common length for 40# steel bar is3000mm, 4000mm, 6000mm, 9000mm. And the price is competitive. If your size can be picked in our warehouse, we can transport the products to the loading port in 3 days. So please be free to contact us if you require steel bar.