SAE 5140 / 40cr Hot Rolled Steel Round Bars with Large Stocks

• Type: Alloy Steel Bar
• Standard: AISI, ASTM, GB, JIS, DIN, BS
• Technique: Hot Rolled
• Application: Structural Steel Bar, Tool Steel Bar, Die Steel Bar
• Alloy: Alloy
• Special Use: Mold Steel, Free Cutting Steel, Cold Heading Steel
• Model NO.: sae 5140 / 40Cr
• Diameter Range of Hot Rolled Steel Bar: 16-310mm
• Grade: SAE 5140 / GB 40cr
• Length: 6m or 6-10m
• MOQ: One Bundle
• Ut Test of Hot Rolled Steel Bars: Sep 1921 C/C
• Transport Package: Standard Export Packing
• Specification: M12-M310
• Trademark: Laiwu Xincheng
• Origin: China
• HS Code: 72283090
• Production Capacity: 3000tons/Month

Product Description

sae 5140 / 40Cr hot rolled steel round bars with large stocks 


(1) 40Cr introduction:
Standard steel GB in China is 40Cr, the German DIN standard material No. 1.17035/1.7045, German standard DIN grade 41Cr4/42Gr4, EN grade 18 British standard, the British standard BS steel 41Cr4, France AFNOR 42C4 France NF steel standard, standard grade of steel 38Cr4/41Cr4, Italy UNI 41Cr4 Belgium NBN steel standard, standard grade of steel 42Cr4, Sweden SS standard grade 2245. The American AISI/SAE/ASTM standard grade 5140, the Japanese JIS standard grade SCr440 (H) /SCr440, the international organization for standardization ISO standard steel 41Cr4.

(2) Chemical composition of 40Cr steel 

rade	C	Si	Mn	Cr	Ni(≤)	Cu(≤)	P(≤)	S(≤)
40Cr	0.37-0.44	0.17-0.37	0.5-0.8	0.8-1.0	0.3	0.03	0.035	0.035

 
(3) Physical property of 40Cr after Q&T 
Sample blank size (mm):25
The first quenching heating temperature (ºC):850; coolant: Oil
Second quenching heating temperature (ºC):-
Tempering heating temperature (ºC):520;
Tensile strength (σb/MPa): ≥980
The yield point (σs/MPa): ≥785
Elongation (δ5/%): ≥9
Section shrinkage (ψ/%): ≥45

(4)Quality control for 40Cr steel 
1.Processing Line:
Iron - hot metal pretreatment - Converter - Refining --VD / RH- - Continuous Casting - Hot Rolling (KOCKS) - heat --UT Check - Processing and Distribution Center
Electric Furnace - Refining --VD / RH- - Continuous Casting - Hot Rolling (KOCKS) - heat --UT Check - Processing and Distribution Center
2.Gas content level:O2 - <20 ppm H2 - <2 ppm N2- <100 ppm
3.Grain Sizes:5-8
4. non-metallic inclusions contorlling level

	A	B	C	D
	MAX	MAX	MAX	MAX
Thin	2	2	2	2
Thick	1	1	1	1

(5)Delivery conditions and available sizes:

Delivery condition	Diameter ranges
Hot tolled	M12-M310
Hot rolled+Q&T(Quenched and tempered)	M12-M310.
Cold drawn +Q&T(Quenched and tempered)	M10-M100
Peeled / Peeled+Q&T	M10-M100
Forged/Forged+Heat treatment.	M250-M1000

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