SAE 5140 Quenched and Tempered Steel Round Bar / 40Cr 8.8 QT Steel Bars with Pitch Size
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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