Product Description
Low alloy high strength steel is a kind of engineering structural steel developed by adding a small amount of Mn, Si, Nb, V, Ti, Al and other alloy elements on the basis of carbon structural steel. The so-called low alloy means that the total amount of alloy elements in steel does not exceed 3%. High strength is relative to carbon engineering structural steel. The development principle of low alloy high strength steel is to use as few alloying elements as possible to obtain as high comprehensive mechanical properties as possible, so as to meet the purpose of use and low cost. Low alloy high-strength steel can meet the requirements of large bearing capacity of various structures (such as large bridges, pressure vessels, ships, etc.) in engineering, and at the same time, it is required to reduce the dead weight of structures, improve reliability, and save materials and resources. This kind of steel is mainly used to manufacture various engineering structures with high strength requirements, such as bridges, ships, vehicles, high pressure vessels, oil and gas pipelines, large steel structures, etc. Because this kind of steel can obtain high strength without complex treatment process or even heat treatment, which greatly reduces the quality of engineering structures, it is used to replace general carbon structural steel.
chemical composition
| component |
C |
Si |
Mn |
P |
S |
Cr |
Ni |
Cu |
Mo |
| minimum value |
0.35 |
0.2 |
0.3 |
- |
- |
1.35 |
- |
- |
0.15 |
| maximum value |
0.42 |
0.45 |
0.6 |
0.035 |
0.035 |
1.65 |
0.3 |
0.3 |
0.25 |
Product Parameters
| ALLOY STRUCTURE STEEL |
| Grade |
AISI /ASTM |
DIN (W.Nr) |
JIS |
EN/ BS |
GB |
| 5120 |
5120 |
1.7027 /21Cr4 |
SCr420 |
|
20Cr |
| 530M40 /5140 |
530M40 /5140 |
1.7035 /41Cr4 |
SCr440 |
|
40Cr |
| 5145 |
5145 |
|
Scr445 |
|
45CR4 |
| 4118 |
4118 |
1.7243 /18CrMo4 |
SCM418 / SCM420 |
|
20CrMo |
| 4135 |
4130 |
1.7218 /25CrMo4 |
SCM430 |
708A25/ 708M25 |
30CrMo |
| 4140 |
4140 |
1.7225 /42CrMo4 |
SCM440 |
EN19/ 709M40 |
42CrMo |
| 4340 |
4340 |
1.6582/ 34CrNiMo6 |
SNCM 439/ SNCM8 |
EN24/ 817M40 |
40CrNi2Mo |
| 8620 |
8620 |
1.6523/ 21NiCrMo2 |
SNCM220 |
805M20 |
20CrNiMo |
| CARBON STEEL |
| 20 |
1020 |
C22. CK22 |
S20C |
EN3B /070M20 |
20 |
| 35 |
1035 |
C35.CK35 |
S35C |
|
35 |
| 45 |
1045 |
C45.CK45 |
S45C |
EN8D/C45E |
45 |
| 50 |
1050 |
CK53 |
S50C |
EN9/070M55 |
50 |
| Q355 |
|
S355J /ST52 |
|
EN14 |
Q355 |
| 30Mn |
1030.1033 |
|
S30C |
|
30Mn |
| 30Mn2 |
1330 |
30Mn5 |
SMn433h |
|
30Mn2 |
| STAINLESS STEEL |
| steel grades: 304, 304L, 316, 316L, 321, 410 430, 431, 2205, 2304, 2507. F53, F55 |
Mechanical properties
Tensile strength σb (MPa):≥980(100)
Yield strength σs (MPa):≥835(85) Elongation δ5 (%):≥14
Reduction rate of cross-section (%):≥50
Impact energy Akv (J):≥71
Impact toughness value αkv (J/cm2):≥88(9)
Hardness :≤229HB
Sample size: sample blank size is 30mm
Heat treatment
1. Heat treatment specification and metallographic structure:Heat treatment specification: quenching 940 ºC, water cooling, oil cooling; Tempering 640 ºC, water cooling, oil cooling.
2. Delivery status:
delivery shall be made in (normalizing, annealing or high temperature tempering) or non heat treatment status, and the delivery status shall be indicated in the contract.
3. Annealing No.1 "760 ± 10 ºC annealing, furnace cooling to 400 ºC air cooling.
FAQ
1. Who are we?
Our headquarter is located in Shandong, China. Since 2022, we have sold to North America (60.00%), Western Europe (14.00%) and South America (6.00%). There are about 11-50 people in our office.
2. How do we guarantee quality?
Always provide pre-production samples before mass production;
Always carry out final inspection before shipment;
3. What can you buy from us?
Copper, aluminum, die steel, titanium, customized machine parts
4. Why should you buy from us instead of other suppliers?
The company has 25 years of production experience. It has advanced precision production equipment, modern large warehouse, 200000 tons of inventory goods and a number of long-term stable cooperative customers.
5. What services can we provide?
Accepted delivery conditions: FOB, CFR, CIF, EXW
Accepted payment currency: US dollar, Euro, Japanese yen, Canadian dollar, Australian dollar, Hong Kong dollar, British pound, RMB, Swiss franc;
Accepted payment type: T/T, L/C, D/P D/A, PayPal;
Optional ports: Tianjin, Shanghai, Guangzhou;
Spoken: English, Chinese
6. How can we get your price?
A. We need the following information to quote for you:
1). Product Name
2). standard
3). Material grade (chemical composition)
4). dimension
5). amount
6). Special part drawing
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