5140 B7 S275jr S235jr Ss400 Alloy Mild Steel Round Bar for Bolts

• Customization: Available
• Type: Round
• Standard: AISI, ASTM, DIN, JIS, GB
• Model NO.: steel bar
• Composition: Alloy Grade or Mild Grade
• Technique: Cold Drawn
• Shape: Bar
• Surface Treatment: Polished
• Special Use: Cold Heading Steel
• Application: Structural Steel Bar
• Size Tolerance: H10,H9,H11
• Supply Condition: Qt or Cold Drawn
• Transport Package: Seaworthy Packaging
• Specification: 10mm-100mm
• Trademark: laiwu steel
• Origin: China
• Production Capacity: 2000tons

Product Description

5140 ML40Cr SCr440 GR8.8 alloy steel round bar
1.5140 40cR Scr440 Gr8.8 steel bar Main standard

GB	JIS	DIN	ASTM/AISI/SAE
40Cr	SCr40	41Cr4	5140

2.5140 40cR Scr440 Gr8.8 steel bar chemical compition

C	SI	MN	S	P	Cr	Ni/Cu
0.38-0.43	0.15-0.35	0.70-0.90	0.025 (max)	0.025 (max)	0.70-0.90	0.25 (max)

3.40Cr  5140 41Cr4 SCr440 steel bar Mechanical Properties with QT
Hardness:207HB or according to client's request
Tensile  strength:Min 980MPA  
Yield  strength: Min 785MPA
elogation:9%  Reduction  of  area:45%  
AKV(impact  value):59J
4.our 40Cr  5140 41Cr4 SCr440 steel bar avaiable size 

Hot rolled round bars	16mm to 350mm
Cold drawn bars	6mm to 50mm
Forged round bars	200mm-800mm

5.40Cr  5140 41Cr4 SCr440 hot rolled steel round bar Quality Control Process 



3)Gas Contents:

Oxygen	Nitrogen	Hydrogen
20ppm(max)	90ppm(max)	2ppm(max)

4)Inclusion Rating:ASTM E45A

	A	B	C	D
	MAX	MAX	MAX	MAX
Thin	2.5	2.0	0.5	0.5
Thick	1.5	1.0	1.0	1.0

5)Common Grain Size: 5 to 8
6)Billet/steel bloom size
20-50mm: 180*220mm steel billet
52-85mm: 180*220mm steel billet
85-120mm: 260*300mm steel billet
130-210mm: 650mm round billet
210-350mm:800mm steel billet
6.Steel bar Supply condition Surface Treatment: Peeling, Turning, Grinding, Milling, Drilling, Boring
Heat Treatment: Normalizing, Annealing, Quenching+ Tempering
7.Straightness: 3mm/m(max)
8. Steel bar Packing:
*Bars from different heats will not be mixed and dispatched.
*Bars will be bundles and securely metal strapped in 3 min places of the bar length and tagged properly.
*For further processing products such as cold drawn/peeled or heat treated goods, plastics bag wrapped or pallet loading is available according to customer's demands.

1. Delivery time of steel bar:7-10days of stock,30 days after order confirmed of new material
2. Payment term:TT or LC
3. Free sample:Yes
4. steel bar Inspection: Spectral Tested, Microstructure Tested,Hardness Test,Macrostructure Test,UT sep1921 C/c
5. 5.Our steel bar mill's certificate

ISO901&ISO.TS16949,ISO4001,OHSAS18001
Special Equipment Manufacturing License of P.R.C for pipeline plate,steel plate for boiler&Vessel;SO/TS16949 2009 for Manufacturing of Special steel;
Europe CE Mark Certificate;
JIS MARK,KS MARK.