GR8.8 bolts raw material GR8.8 equivalent Gr8.8 threaded rod
5140 ML40Cr SCr440 GR8.8 alloy steel round bar
1.5140 40cR Scr440 Gr8.8 steel bar Main standard
| GB |
JIS |
DIN |
ASTM/AISI/SAE |
| 40Cr |
SCr40 |
41Cr4 |
5140 |
2.5140 40cR Scr440 Gr8.8 steel bar chemical compition
| C |
SI |
MN |
S |
P |
Cr |
Ni/Cu |
| 0.38-0.43 |
0.15-0.35 |
0.70-0.90 |
0.025 (max) |
0.025 (max) |
0.70-0.90 |
0.25 (max) |
3.40Cr 5140 41Cr4 SCr440 steel bar Mechanical Properties with QT
Hardness:207HB or according to client's request
Tensile strength:Min 980MPA
Yield strength: Min 785MPA
elogation:9% Reduction of area:45%
AKV(impact value):59J
4.our 40Cr 5140 41Cr4 SCr440 steel bar avaiable size
| Hot rolled round bars |
16mm to 350mm |
| Cold drawn bars |
6mm to 50mm |
| Forged round bars |
200mm-800mm |
5.40Cr 5140 41Cr4 SCr440 hot rolled steel round bar Quality Control Process
1)s45c c45 sae1045 aisi1045 steel bar Production Line
Blast Furnace Melton Iron → EAF(EBT/BOV) → LF → VD → Molten Steel → Continuous Casting → Hot Rolling(KOCKS) → UT Check - Processing and Distribution Center( Further processing Cold Drawn/Peeling/Turning or QT/annealing)
2)Iron - hot metal pretreatment - Converter - Refining --VD / RH- - Continuous Casting - Hot Rolling (KOCKS) --UT Check - Processing and Distribution Center( Further Processing Cold Drawn/Peeling/Turning or QT/annealing)
3)Gas Contents:
| Oxygen |
Nitrogen |
Hydrogen |
| 20ppm(max) |
90ppm(max) |
2ppm(max) |
4)Inclusion Rating:ASTM E45A
| |
A |
B |
C |
D |
| |
MAX |
MAX |
MAX |
MAX |
| Thin |
2.5 |
2.0 |
0.5 |
0.5 |
| Thick |
1.5 |
1.0 |
1.0 |
1.0 |
5)Common Grain Size: 5 to 8
6)Billet/steel bloom size
20-50mm: 180*220mm steel billet
52-85mm: 180*220mm steel billet
85-120mm: 260*300mm steel billet
130-210mm: 650mm round billet
210-350mm:800mm steel billet
6.Steel bar Supply condition Surface Treatment: Peeling, Turning, Grinding, Milling, Drilling, Boring
Heat Treatment: Normalizing, Annealing, Quenching+ Tempering
7.Straightness: 3mm/m(max)
8. Steel bar Packing:
*Bars from different heats will not be mixed and dispatched.
*Bars will be bundles and securely metal strapped in 3 min places of the bar length and tagged properly.
*For further processing products such as cold drawn/peeled or heat treated goods, plastics bag wrapped or pallet loading is available according to customer's demands.
9.Delivery time of steel bar:7-10days of stock,30 days after order confirmed of new material
Payment term:TT or LC
Free sample:Yes
steel bar Inspection: Spectral Tested, Microstructure Tested,Hardness Test,Macrostructure Test,UT sep1921 C/c
10.Our steel bar mill's certificate
ISO901&ISO.TS16949,ISO4001,OHSAS18001
Special Equipment Manufacturing License of P.R.C for pipeline plate,steel plate for boiler&Vessel;
ISO/TS16949 2009 for Manufacturing of Special steel;
Europe CE Mark Certificate;
JIS MARK,KS MARK.
With dynamic and passionate professional sales team and technical team,Our company Dajin make great efforts to integrate China's steel resources and dedication to customers the provision of specialized steel products and services.Hope establish a good relationship with clients, growth together.
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