| 1. Introduction |
This big alloy steel bar mill was put into production in October, 2014. Its product focuses on offering middle sized high-end special steel for automobile, engineering, equipment, and shipbuilding and etc.
| 2. Specifications |
| specifications | delivery condition | steel category | |
| Round bar | ∮80～350 | Rolled/Annealing/QT | High quality carbon steel/ alloy tool steel/carbon tool steel/pipeline steel |
| ∮80～200 | Rolled/Annealing | Bearing steel | |
| Square and flat bar | 150～280×150～280 | Rolled/Annealing | High quality alloy steel/ alloy tool steel/carbon tool steel |
| 3. Process Flow |
| 4. Product Standards |
| Category | Grade | Different Material Standards | Specification（mm） | Production standards | ||
| ASTM/SAE/AISI | JIS | DIN | ||||
| High quality carbon steel | 20～45 | 1020, 1045 | S20C, S45C | C22, C22E, CK22, C45, C45E, CK45 | ∮80～350 150～280×150～280 |
GB, ASTM, JIS, DIN or customer specified requirements |
| Alloy steel | 40Mn2, 40Cr 42CrMoA | 4140 | SCr440, SCM440 | 42CrMo4 | ∮80～350 150～280×150～280 |
GB, ASTM, JIS,DIN or customer specified requirements |
| Gear steel | 40CrH, 20CrMnTi, 20CrMoH, 20CrNiMoH | 4120H, 8620H | SCr440H, SCM420H, SCM822H | 16CrNi4, 19CN5, 16～28MnCr5 | ∮80～350 150～280×150～280 |
GB, ASTM, JIS, DIN or customer specified requirements |
| Non-QT steel | F48MnV, F40MnVS, 12Mn2VB, C38N2 | ∮80～350 150～280×150～280 |
GB, ASTM, JIS, DIN or customer specified requirements | |||
| Bearing steel | GCr15, GCr15SiMn, GCr18Mo | 52100 | SUJ2, SUJ3, SUJ4 | 100Cr, 100CrMo6 | ∮80～200 | GB or customer specified requirements |
| Spring steel | 60Si2CrVA, 60Si2MnA and etc. | 9260H | SUP6 | 60SiCr7 | ∮80～350 150～280×150～280 |
GB or customer specified requirements |
| Pipeline steel | 37Mn5, L290, 29Mn2, 12Cr1MoVG, P91, P92 | ∮80～350 | GB or customer specified requirements | |||
| Alloy tool steel | 5CrMnMo, 5CrNiMo, 4Cr5MoSiV1 and etc. | L6, H13 | SKT4 | 40CrMnMo7, 55NiCrMoV6, X40CrMoV51 | ∮80～350 150～280×150～280 |
GB or customer specified requirements |
| 5. Product Quality Level |
| Category | Grade | Chemical component | Non-metallic Inclusion | Hardenability HRC |
||||||||||
| P≤ (%) |
S≤ (%) |
[O] ≤ (ppm) |
A thin≤ |
A heavy≤ |
B thin≤ |
B heavy≤ |
C thin≤ |
C heavy≤ |
D thin≤ |
D heavy≤ |
Ds≤ | |||
| Carbon steel | SAE1045, S45C, CK45, 45 | 0.015 | 0.005 | 20 | 1.5 | 1.0 | 1.5 | 1.0 | 0 | 0 | 1.5 | 1.0 | ||
| Alloy steel | 42CrMo, 40Cr | 0.015 | 0.005 | 20 | 1.5 | 1.0 | 1.5 | 1.0 | 0 | 0 | 1.5 | 1.0 | 1.5 | |
| Pipeline steel | 37Mn5, L290, 29Mn2, 12Cr1MoVg | 0.015 | 0.005 | 20 | 1.5 | 1.0 | 1.5 | 1.0 | 0 | 0 | 1.5 | 1.0 | ||
| Gear steel | 20CrMoH, 20CrMnTiH, 20CrNiMoH | 0.015 | 0.005 | 20 | 1.5 | 1.0 | 1.5 | 1.0 | 0 | 0 | 1.5 | 1.0 | ≤6 | |
| SCM420H, SCM822H | 0.015 | 0.005 | 20 | 1.5 | 1.0 | 1.5 | 1.0 | 0 | 0 | 1.5 | 1.0 | ≤6 | ||
| Spring steel | 60Si2CrVA | 0.015 | 0.005 | 20 | 1.5 | 1.0 | 1.5 | 1.0 | 0 | 0 | 1.5 | 1.0 | ||
| Bearing steel | GCr15 | 0.015 | 0.005 | 10 | 1.0 | 0.5 | 1.0 | 0.5 | 0 | 0 | 1.0 | 0.5 | 1.0 | |
