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.
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