1.6511 (36CrNiMo4) is a high-strength alloy steel from German standards (DIN/EN). This low-alloy nickel-chromium-molybdenum steel excels in toughness and hardenability. It supports stainless steel pipes and fittings under heavy loads. Industries like automotive and aerospace rely on it for durability.
What Makes 1.6511 Special?
This steel blends strength, toughness, and wear resistance. Manufacturers choose 1.6511 for stainless steel pipe fittings needing reliability. Its unique composition ensures performance in demanding conditions. Let’s explore why it’s a top choice.
Chemical Composition of 1.6511
| Element | C | Si | Mn | P | S | Cr | Ni | Mo |
|---|---|---|---|---|---|---|---|---|
| Content (%) | 0.32-0.40 | 0.17-0.37 | 0.50-0.80 | ≤0.025 | ≤0.025 | 0.90-1.20 | 0.90-1.20 | 0.15-0.30 |
What We Do
KAYSUNS provides a package solutions for piping materials such PIPES, FITTINGS, FLANGES, VALVES in stainless steel, duplex steel and alloy steel etc. We will customize the most suitable products for you. If you have any questions about our company and products, please feel free to contact us.
Mechanical Properties of 1.6511
| Property | Tensile Strength | Yield Strength | Elongation | Impact Toughness |
|---|---|---|---|---|
| Value | 1000-1200 MPa | ≥900 MPa | ≥12% | ≥35 J |
Core Advantages of 1.6511
Reaches 1200 MPa, perfect for heavy-duty stainless steel pipes.
It handles extreme stress without breaking.
Absorbs shocks, ideal for fittings under impact.
This reduces cracking risks in tough jobs.
Ensures uniform hardness in large stainless steel fittings.
Big parts stay strong throughout.
High carbon and carbides protect pipe surfaces.
It extends the life of fittings.
Withstands repeated loads in stainless steel pipes.
This cuts down on failures over time.
Heat Treatment Process
- Annealing: Heat to 850-880°C, then cool slowly. It improves machinability.
- Quenching: Heat to 850°C, cool in oil or water. This boosts hardness.
- Tempering: Heat to 500-650°C (600°C works best). It balances strength and toughness.
Applications in Stainless Steel
- Stainless Steel Pipes: Powers gears and shafts in heavy machinery.
- Stainless Steel Pipe Fittings: Builds strong bolts and connectors.
International Equivalents
| Country/Region | Standard | Grade |
|---|---|---|
| Germany | DIN/EN | 36CrNiMo4 |
| USA | ASTM | 4340 |
| Japan | JIS | SNCM439 |
| China | GB | 40CrNiMoA |
Limitations to Know
- Poor Weldability: Preheat to 250-350°C before welding. Post-weld tempering helps too.
- Limited Corrosion Resistance: Needs coatings like chrome for wet environments.
Processing Tips
- Machining: Use carbide tools at low speeds in tempered state. Annealed, it cuts easily.
- Welding: Opt for TIG or laser welding. Preheat and use low-hydrogen rods.
- Surface Treatment: Add nitride or PVD coatings for extra wear resistance.
Why 1.6511 Matters for Your Project
Choosing 1.6511 ensures strength and longevity. It supports stainless steel pipe fittings in tough conditions. Plus, its global standards guarantee quality. For high-load needs, it’s a smart pick.
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