40cr 41cr4 SAE 5140 / ISO Gr. 8.8 Cold Drawn Qt Steel Round Bars

• Customization: Available
• Type: Alloy Steel Bar
• Standard: AISI, ASTM, GB, JIS, DIN, BS
• Model NO.: 40cr 41cr4 SAE 5140
• Application: Structural Steel Bar, Tool Steel Bar, Die Steel Bar
• Surface Treatment: Oiled
• Alloy: Alloy
• Special Use: Mold Steel, Cold Heading Steel
• Grade: 40cr / SAE 5140
• Property Standard: Grade8.8
• Delivery Condition: Quenched and Tempered
• MOQ: 2tons Per Size
• Sample: Free Samples Supplied
• Transport Package: Standard Export Packing
• Specification: M8-M64
• Trademark: Laiwu Xincheng
• Origin: China
• HS Code: 72283090
• Production Capacity: 3000tons/Month

Product Description

Product Description

40Cr / SCr440 / 5140 / 41Cr4 Quenched and Tempered Steel bars for Gr.8.8 / Gr.10.9 Bolts 

Gr.8.8 10.9 round bars is the right material for Gr.8.8 & 10.9 threaded rods, anchor bolts, stud bolts , such high strength steel round bars, our processing usually have : Hot rolled, Hot rolled+Q&T, Cold drawn+Q&t, Peeled+Q&T and so on.

Our QT processing will be done thought the Medium frequency quenching furnace, which can gurantee the good straightness. so during the production of threading, it will have no hurt to the mould.

1.Materials equivalent grade 

ASTM	JIS	DIN	BS	NF
5140	SCr440	41Cr4(1.7035)	530A40	42C4

2.SAE 5140 40Cr chemical composition

Grade	C	Si	Mn	Cr	P(≤)	S(≤)
40Cr	0.37-0.44	0.17-0.37	0.5-0.8	0.8-1.0	0.035	0.035
SAE 5140	0.38-0.43	0.15-0.35	0.7-0.9	0.7-0.9	0.035	0.035
SCR440	0.38-0.43	0.15-0.35	0.6-0.9	0.9-1.2	0.035	0.035
40X	0.36-0.44	0.17-0.37	0.5-0.8	0.8-1.1	0.035	0.035
41Cr4	0.38-0.45	0.1-0.4	0.6-0.9	0.9-1.2	0.035	0.035

3.Grade 8.8 & 10.9properties:

Grade	Tensile Strength	Yield Strength	Elongation	Reduction	-40ºCAkv2/J	Hardness
	Mpa	Mpa	%	%
10.9	≥1040	≥940	≥9	≥48	≥50	HRC32-39
8.8	≥830	≥660	≥12	≥52	≥70	HRC23-34

4.Sizes we can offer for 40Cr sae 5140 QT bars :5mm to 64mm .
Above 64mm, we suggest materials of 4140 or 4135.

5.Delivery condition choice:
1.Hot rolled
2.Hot rolled+Q&T
3.Cold drawn+Q&T

6.Quality control:
We company have good QC inspection tear and full set of inspect equipment including: UT test machine, Tensile testing machine,Hardness testing machine,Dimensional measuring instrument,f,spectrometer,Metallographic microscope and so on, so that we can always supply good mateterials for various projects and industries .

7.MOQ for QT steel bars: 2tons
8.Our payment term:TT or LC.
9.Delivery time : 7-30 days upon to your sizes&quantity.