08KH16N13M2B, ЭИ680
08Х16Н13М2Б (ЭИ680) is a Russian-designed austenitic stainless steel optimized for high-temperature strength, corrosion resistance, and creep resistance. It is widely used in chemical processing, power plants, and aerospace due to its stability under extreme conditions.
Table of Contents
What is 08KH16N13M2B, ЭИ680?
08Х16Н13М2Б (ЭИ680) is a versatile austenitic stainless steel with excellent creep resistance, weldability, and corrosion resistance.
International Equivalents
| Country | Standard | Equivalent Grade |
|---|---|---|
| USA | ASTM A240 | AISI 316H |
| EU | EN 10088-2 | X6CrNiMo17-12-2 |
| Japan | JIS G4303 | SUS 316H |
| China | GB/T 1220 | 0Cr17Ni12Mo2 |
Applications
- Chemical Industry: Reactors, pipelines (H₂SO₄, HCl environments).
- Power Plants: Boiler tubes, turbine parts (up to 700°C).
- Aerospace: Exhaust systems, afterburner components.
Chemical Composition (%)
| Element | 08Х16Н13М2Б, ЭИ680 |
AISI 316H | X6CrNiMo17-12-2 |
SUS 316H |
|---|---|---|---|---|
| C | ≤0.08 | 0.04–0.10 | ≤0.08 | ≤0.08 |
| Cr | 15.0–17.0 | 16.0–18.0 | 16.5–18.5 | 16.0–18.0 |
| Ni | 12.0–14.0 | 10.0–14.0 | 10.5–13.5 | 10.0–14.0 |
| Mo | 2.0–2.5 | 2.0–3.0 | 2.0–2.5 | 2.0–3.0 |
| Mn | ≤2.0 | ≤2.0 | ≤2.0 | ≤2.0 |
| Si | ≤0.8 | ≤0.75 | ≤0.75 | ≤1.0 |
| Nb | 0.7–1.2 (stabilizer) | – | – | – |
Material Properties
Room Temperature (Delivery Conditions: +A, +HT, +QT)
| Condition | σₓ (MPa) | σ₀.₂ (MPa) | δ (%) | HB |
|---|---|---|---|---|
| Annealed (+A) | 490–690 | ≥205 | ≥40 | ≤215 |
| Quenched (+QT) | 590–790 | ≥295 | ≥35 | ≤230 |
High-Temperature Strength (500–700°C)
| Temp (°C) | σₓ (MPa) | Creep Limit (10⁵ h, MPa) |
|---|---|---|
| 600 | 340–380 | 90–110 |
| 700 | 220–250 | 40–60 |
Physical Properties
| Property | Value |
|---|---|
| Density (g/cm³) | 7.9 |
| Melting Point (°C) | 1400–1450 |
| Thermal Conductivity (W/m·K) | 15.0 (20°C), 22.5 (600°C) |
| Coefficient of Expansion (10⁻⁶/K) | 16.0 (20–600°C) |
Heat Treatment
- Annealing (A): 1050–1100°C, rapid cooling (water/air) for stress relief.
- Quenching & Tempering (QT):
- Quench: 1100–1150°C → water
- Temper: 700–750°C → air (for improved toughness)
- Solution Treatment (HT): 1150–1200°C → rapid cool (for max corrosion resistance).
Processing Performance
- Machining: Use carbide tools, low speeds, and high feeds.
- Welding:
- Recommended methods: TIG, MIG, SAW.
- Filler metals: ЭИ680-compatible rods (e.g., ЦТ-15).
- Post-weld heat treatment (PWHT): Stress relief at 850–900°C.