Grade8.8 Round Bars / ISO Gr8.8 40cr 5140 Round Plain Bars for Bolts

• Customization: Available
• Type: Alloy Steel Bar
• Application: Structural Steel Bar, Tool Steel Bar, Die Steel Bar
• Model NO.: Grade8.8
• Surface Treatment: Q&T (Quenched & Tempered)
• Alloy: Alloy
• Special Use: Mold Steel, Free Cutting Steel, Cold Heading Steel
• Raw Material: 40cr SAE 5140
• Property Standard: ISO Grade8.8
• Condition 1: Hot Rolled
• Condition 2: Hot Rolled + Qt
• Conditition 3: Cold Drawn+Qt
• Transport Package: Standard Export Packing
• Specification: M12-M100
• Trademark: Laiwu Xincheng
• Origin: China
• HS Code: 72283090
• Production Capacity: 3000tons/Month

Product Description

Grade8.8 round bars / ISO Gr8.8 40Cr 5140 round plain bars for bolts 
SAE 5140 40Cr raw material round bar, Quenched and tempered to Cl8.8/Gr.8.8 property.

1.Introduction of Grade8.8 QT steel bar
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 through 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.

2.AISI 5140/Gr8.8 Steel Chemical composition:

Element	Content (%)
Iron, Fe	97.395-98.07
Manganese, Mn	0.700-0.900
Chromium, Cr	0.700-0.900
Carbon, C	0.380-0.430
Silicon, Si	0.150-0.300
Sulfur, S	≤ 0.0400
Phosphorous, P	≤ 0.0350

3.Equivalent grade to SAE 5140

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

4.Gr.8.8 Steel properties

Yield Strength(MPa)	Tensile Strength(MPa)	Elongation(%)	Reduction of area (%)	Hardness(HRC)
660(min)	830(mIn)	12%(min)	52%(min)	Max 32

5.Delivery condition and sizes we can offer:

Delivery condition	Diameter ranges
Hot rolled	M12-M310
Hot rolled+Q&T(Quenched and tempered)	M12-M310.
Cold drawn +Q&T(Quenched and tempered)	M8-M64
Peeled / Peeled+Q&T	M20-M100
Forged/Forged+Heat treatment.	M250-M1000

6.Advantages of our Grade8.8 steel round bar
Smoth surface and Good straightness
Precision size tolerance for cold drawn & QT steel
Customized length
Standard mechanical proeprties
Uniformed hardness
Anti-rusty packages
Competitive price
Large quantity stock
Fast delivery
Professional service

7.MOQ:1ton per size

8.Delivery time :7-30 days upon to your order details.

9.Quality control:
Process for Steel round bar
Blast Furnance→ Molten Iron Pretreatment→Converter→LF→VD/RH→ContinuousCasting→Hot Rolling(KOCKS)→ Heat Treatment→ UT Inspection→Finish Product
EAF→LF→VD/RH→ Continuous Casting→Hot Rolling(KOCKS)→ Heat Treatment→ UT Inspection→ Finish Product
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 , if you have any need for our producrs,please contact us freely.

10.Why choose us :
Capability from Raw material to processing to final products under one Roof .
Highest customer satisfactionEconomy of products
Absolute reliability
Highly-qualified and motivated personnel
No tolerance of errorsContinuous optimisation of all processes
To stand apart from competition, the company provides  unparalleled value added services to its esteemed customers.The company is pledged to honor its commitment for every order and when great products are backed-up by great services, the combination becomes irresistible.





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