ISO 8.8 Grade SAE 5140 40cr Cold Drawn and Qt Steel Round Bar for Grade 8.8 Bolts

• Customization: Available
• Type: Alloy Steel Bar
• Standard: AISI, ASTM, GB, JIS, DIN, BS
• Model NO.: Grade 8.8 / 40Cr QT
• Technique: Quenched and Tempered
• Application: Gr.8.8 Bolts
• Alloy: Alloy
• Special Use: Gr.8.8 Bolts
• Surface: Oiled
• Standards: Gr.8.8
• Material: 40cr / 5140 Alloy Steel Round Bars
• Length: 3660mm, 6m or as Required
• MOQ: 2tons Per Size
• Transport Package: Sea Worthy Packing
• Specification: 5mm to 120mm
• Origin: China
• HS Code: 72283090
• Production Capacity: 3000tons/Month

Product Description

ISO 8.8 grade SAE 5140 40cr Cold Drawn and QT Steel Round Bar for Grade 8.8 Bolts

Gr.8.8 round bars is the right material for Gr.8.8 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 properties:

Tensile strength	Yiled strength	Elongation	Reduction area
Min	Min	Min	Min
830	640	12%	50%

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.