5140 ML40Cr SCr440 GR8.8 alloy steel round bar
5140 to make bolts
1.Main standard
| GB | JIS | DIN | ASTM/AISI/SAE |
| 40Cr | SCr40 | 41Cr4 | 5140 |
3.Chemical composition:
| 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) |
4.Quality Control Process
1)Production Line
Blast Furnace Melton Iron → EAF(EBT/BOV) → LF → VD → Molten Steel → Continuous Casting → Hot Rolling(KOCKS) → Spheroidizing Annealing(as customer's option) → Further Processing
(Cold Drawn/Peeling/Turning)
(as customer's option)
2)Gas Contents:
| Oxygen | Nitrogen | Hydrogen |
| 20ppm(max) | 90ppm(max) | 2ppm(max) |
3)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 |
4)Grain Size: 5 to 8
5.Avaiable size
| Wire rods | 6.5mm to 36mm |
| Hot rolled round bars | 16mm to 200mm |
| Cold drawn bars | 6mm to 50mm |
6.Supply condition Surface Treatment: Peeling, Turning, Grinding, Milling, Drilling, Boring
Heat Treatment: Normalizing, Annealing, Quenching+ Tempering
7.Straightness: 3mm/m(max)
7.Packaging:seaworthy packaging by wire rod,every bunled is about 3-5MT,or as customer's request
8.our service
Contacts person:Ms.Sunny Sun
S-kype:sunny88962
Q+T heat treatment alloy steel round bar
we have been specialized in exporting steel products for more than 10 years,include:steel bars(round,square,flat bars),steel sheets,steel plates.steel billets,steel profiles,H beam,Channel beam,I beam,and so on.Prices and quality,service are always good.
Other grade
| Grade | C | Si | Mn | P | S | N |
| S235JR | Max 0.17 |
| Max 1.40 | Max 0.030 | Max 0.030 | Max 0.009 |
| S275JR | Max 0.20 |
| Max 1.50 | Max 0.030 | Max 0.030 |
|
| S355JR | Max 0.24 | Max 0.55 | Max 1.60 | Max 0.030 | Max 0.030 | Max 0.009 |
| S355J0 | Max 0.22 | Max 0.55 | Max 1.60 | Max 0.030 | Max 0.030 |
|
Qingdao Helio Steel Co., Ltd. Was established in March19, 2012. Our company's business staff members possess professional service capabilities of steel products, with more than a decade of experience on steel production, technology development, product sales and foreign trade. We comply the principle of friendly cooperation and mutual benefit, and persist in developing together with new and old customers.
Our company is located in Qingdao, a coastal city of Shandong Province, which is near Laiwu Steel Group. Only Laiwu City has steel production capacity of 20 million tons each year. Meanwhile, it is also the largest production base of powder metallurgy products in the whole country. Otherwise, there are more than ten well-known steel manufacturers within the province and the surrounding areas, so steel resources here is abundant and we can meet customers' various requirements.
Our company is mainly engaged in steel products for various specifications and materials, such as continuous casting billets, continuous casting tubes, hot-rolled bars, tubes, hot-rolled square steel, flat steel, H section steel, hot-rolled coils, cold-roll large-size panels, forging materials, and forgings.
We also run the import and export of steel products, based on the needs of customers at home and abroad to develop a variety of special steel products and timely delivery. I hope to sincerely cooperate with domestic and foreign customers, providing high-quality and low-priced products and professional services.
