Sichuan Liaofu Special Steel Company is one of the most experienced manufacturers and suppliers of 1.6758 steel equivalent 23mnnimocr5-4 steel bar in China. With over 20 years' experience, our factory offer high quality products made in China with competitive price. Welcome to contact us for wholesale service.
Products Description
1.6758 steel is also known as 23MNNIMOCR5-4 rebar, it is a high-strength alloy steel, 1.6758 steel is characterized by its chemical composition, including nickel, manganese, molybdenum, chromium and carbon and other elements. These elements give steel its high strength, durability and resistance to wear. 1.6758 Steel is commonly used in the manufacture of mechanical parts such as gears, axles and shafts, as well as in the construction of pipes and pressure vessels, in the automotive industry, for the manufacture of engine parts such as crankshafts, camshafts and connecting rods.
| Quality | 23MNNIMOCR5-4 Steel Bar |
| Accoding to standards | DIN17115:1987 |
| flame and induction hardening steel | datasheet lucefin group rev.2018 |
Chemical composition
| C% |
si% max |
Mn% | P% |
S% max |
Cr% | Mo% | Ni% | Ai% |
Cu% max |
N% max |
| 0.20-0.26 | 0.25 | 1.10-1.40 | 0.020 | 0.020 | 0.40-0.60 | 0.50-0.60 | 0.90-1.10 | 0.020-0.050 | 0.25 | 0.012 |
| others | P+S max 0.035% | |||||||||
Temperature °C
| Hot forming | Normalizing+N |
Quenching +Q |
Hardening carburizing surface |
Tempering +T |
Treated for cold shearbility |
| 1100-900 |
860-900 air |
870-890 water |
880-950 | min 400 | (HB max 255) |
|
Soft annealing +A |
Spheroidized annealed (GKZ) |
End quench |
Preheating welding |
Stress relieving after welding |
|
| 650-720 air (HB max 235) |
800-820 fumace coling to 160 then air (HB 150- 210) |
880 water |
150-350 | 600 furmace coling | |
| welding must be made on the annealing | |||||
|
Ac1 Ac3 722 785 |
Ms Mf 380 165 |
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2.Product Application Areas:
this product is used for link chains
3.Similar steel grade & equivalent steel materials:
|
USA |
Japanese |
Gemany |
British |
France |
heat treatment |
Chinese |
|
ASTM&AISI&SAE |
JIS |
EN DIN |
EN BS |
EN NF |
ISO |
GB |
|
23MNNIMOCR5-4 1.6758 |
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Cr12Mo1v1 |
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we have sold A2 1.2379 86CRMOV7 1.2344 flat bar and forged round bar to germany,singapore,pakistan and so on,u can find some pictures below
23MNNIMOCR5-4 turned surface bar
23MNNIMOCR5-4 Alloy steel bar 1.6758 For Link Chains,1.6758 steel equivalent 23MNNIMOCR5-4 steel bar
23MNNICRMO5-2, 1.6541, 23MNNICRMO5-3, 1.6540, 23MNNIMOCR5-4, 1.6758 - STRUCTURAL ALLOY STEEL USED FOR MINING CHAIN LINKS ACCORDING TO PN-H-93028, PN-H-84023, DIN 17115.
23MNNIMOCR5-4 alloy steel with below chemical composition 1.6758 steel
FAQ
Q: Why is 1.6758 specifically chosen for mining chain links?
A: It is a micro-alloyed steel designed for high toughness and fatigue resistance. The addition of nickel and molybdenum provides the exact balance of strength and ductility needed to withstand the heavy dynamic shocks of mining conveyor chains.
Q: Can I weld 1.6758 chain links using standard procedures?
A: No, it requires precise control. You must weld in the annealed condition, preheating to 150-350°C. After welding, you must immediately stress-relieve at 600°C to prevent cold cracking. Always follow your approved welding procedure (WPS).
Q: What is the standard heat treatment for 1.6758 to achieve maximum strength?
A: The steel is typically quenched at 870-890°C in water, followed by tempering at a minimum of 400°C. This achieves a hardness of up to 255 HB, providing the optimal combination of core strength and surface wear resistance for chains.
Q: Do you supply 1.6758 in the soft-annealed condition?
A: Yes, the base material is produced at our in-house base and supplied soft-annealed (max 235 HB) or spheroidized annealed (150-210 HB). This is necessary for the heavy cold bending and forming required to make chain links.
Q: Are third-party mechanical property tests available for this grade?
A: Yes. We can arrange SGS or BV to test the tensile strength, yield strength, and impact toughness of your specific heat. This is highly recommended for safety-critical lifting and mining applications.
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