Ml40cr 5140 Gr10.9 Gr8.8 Qt Steel Bar for High Strength Bolts

• Type: Alloy Steel Bar
• Standard: AISI, ASTM, DIN, JIS, GB, BS
• Composition: Ferrous Steel Scrap
• Technique: Hot Rolled or Cold Drawn
• Shape: Bar
• Surface Treatment: as Client′s Requriement
• Model NO.: steel bar
• Special Use: Cold Heading Steel, Mold Steel
• Application: Structural Steel Bar
• Raw Material: Alloy Steel Bar
• Main Grade: 5140 4140 4130 B7 Ml40cr B7
• Main Usage: High Tensile Botls, Studs, Nuts
• Heat Treatment: Qt
• Transport Package: Seaworhty Packaging
• Specification: 5-200mm
• Trademark: dajin
• Origin: China
• Production Capacity: 1000

Product Description

ML40Cr 5140 GR10.9 GR8.8 QT steel bar for high tensile bolts
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.