SAE5140 SCR440 40cr B7 Alloy Steel Round Bar for High Tensile Bolts

• Type: Round
• Standard: AISI, ASTM, DIN, JIS, GB
• Composition: Alloy Steel
• Technique: Cold Drawn
• Shape: Bar
• Surface Treatment: Polished or Bright Surface
• Model NO.: steel bar
• Special Use: Cold Heading Steel, Free Cutting Steel
• Application: Structural Steel Bar
• Supply Condition: Qt/Normalized/Peeled/Cold Drawn
• Surface: Black or Bright Smoothly
• Diameter Tolerance: H8,H9,H10,H11
• Main Usage: Shaft or Bolts
• Factory Visiting: Yes
• Transport Package: Anti-Rust Packaging
• Specification: diameter: 10mm-130mm
• Trademark: customized
• Origin: China
• Production Capacity: 5000tons

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 

1. s45c c45 sae1045 aisi1045 steel bar Production Line

 Blast Furnace Melton Iron → EAF(EBT/BOV) → LF → VD → Molten Steel → Continuous Casting → Hot Rolling(KOCKS) → UT Check - Processing and Distribution Center( Further processing Cold Drawn/Peeling/Turning or QT/annealing) 
2)Iron - hot metal pretreatment - Converter - Refining --VD / RH- - Continuous Casting - Hot Rolling (KOCKS)  --UT Check - Processing and Distribution Center( Further Processing Cold Drawn/Peeling/Turning or QT/annealing)

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

10.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;
ISO/TS16949 2009 for Manufacturing of Special steel;
Europe CE Mark Certificate;
JIS MARK,KS MARK.

With dynamic and passionate professional sales team and technical team,Our company Dajin make great efforts to integrate China's steel resources and dedication to customers the provision of specialized steel products and services.Hope establish a good relationship with clients, growth together.