Steam turbine blade steel

**Steel Grades, Chemical Compositions, and Mechanical Properties of Steam Turbine Blades** ### **Steel Grades and Chemical Compositions for Steam Turbine Blades** Below is a detailed table listing the chemical compositions of various steel grades commonly used in steam turbine blades: | Brand | C | Si | Mn | Ni | Cr | Mo | W | V | Cu | |---------------|-------|-------|-------|-------|-------|-------|-------|-------|------| | 1Cr13 | ≤0.15 | ≤1.00 | ≤1.00 | ≤0.60 | 11.50–13.00 | - | - | - | - | | 1Cr12 | 0.10–0.15 | ≤0.60 | ≤0.60 | ≤0.60 | 11.50–13.00 | - | - | - | ≤0.30 | | 2Cr13 | 0.16–0.24 | ≤0.60 | ≤0.60 | ≤0.60 | 12.00–14.00 | - | - | - | - | | 1Cr12Mo | 0.10–0.15 | ≤0.50 | 0.30–0.60 | 0.30–0.60 | 11.50–13.00 | 0.30–0.60 | - | - | - | | 1Cr11MoV | 0.11–0.18 | ≤0.60 | ≤0.60 | 10.00–11.50 | 0.50–0.70 | - | 0.25–0.40 | - | - | | 1Cr12W1MoV | 0.12–0.18 | 0.50–0.90 | 0.40–0.50 | 11.00–13.00 | 0.50–0.70 | 0.70–1.10 | 0.15–0.30 | - | - | | 2Cr12MoV | 0.18–0.23 | 0.30–0.80 | 0.30–0.50 | 11.00–12.50 | 0.80–1.20 | - | 0.25–0.35 | - | - | | 2Cr12Ni1Mo1W1V| 0.15–0.21 | 0.50–0.90 | 0.80–1.20 | 11.00–13.00 | 0.70–1.10 | 0.75–1.05 | 0.15–0.30 | - | - | | 2Cr12NiMo1W1V | 0.20–0.25 | 0.50–1.00 | 0.50–1.00 | 11.00–12.50 | 0.90–1.25 | 0.90–1.25 | 0.20–0.30 | 0.30 | - | | 0Cr17Ni4Cu4Nb | ≤0.055 | ≤1.00 | ≤0.50 | 3.80–4.50 | 15.00–16.00 | Nb+Ta: 0.15–0.35 | - | 3.00–3.70 | - | **Notes:** 1. The 0Cr17Ni4Cu4Nb grade contains no more than 0.050% aluminum, 0.05% titanium, and 0.05% nitrogen. Chromium content can reach up to 16.50% under certain conditions. 2. For 0Cr17Ni4Cu4Nb, phosphorus and sulfur contents are not more than 0.035% and 0.030%, respectively. Other grades have phosphorus and sulfur contents not exceeding 0.030%. 3. All values represent mass fractions. --- ### **Heat Treatment Systems for Steel Used in Steam Turbine Blades** | Brand | Quenching (°C) | Tempering (°C) | High Temperature Tempering (°C) | Cooling Method | |---------------------|----------------|----------------|----------------------------------|----------------| | 1Cr13 | 800–900 | 700–770 | 950–1000 | Oil | | 1Cr12 | 800–900 | 700–770 | 980–1040 | Oil | | 2Cr13 | 800–900 | 700–770 | 950–1020 | Air/Oil | | 1Cr12Mo | 800–900 | 700–770 | 950–1000 | Oil | | 1Cr11MoV | 800–900 | 700–770 | 1000–1050 | Oil/Air | | 1Cr12W1MoV | 800–900 | 700–770 | 1000–1050 | Oil | | 2Cr12MoV | 880–930 | 750–770 | 1020–1070 | Oil | | 2Cr12Ni1Mo1W1V | 800–900 | 700–770 | 1020–1060 | Oil | | 2Cr12NiMo1W1V | 860–930 | 750–770 | 980–1040 | Oil | | 0Cr17Ni4Cu4Nb | 1020–1060 | 600–700 | Precipitation hardening | Air | **Note:** The air cooling rate must be at least 14°C/min. --- ### **Mechanical Properties of Steel for Steam Turbine Blades** | Brand | Heat Treatment | Yield Strength (MPa) | Tensile Strength (MPa) | Elongation (%) | Reduction of Area (%) | Impact Energy (J) | Hardness (HBS) | |---------------------|----------------|----------------------|-------------------------|----------------|------------------------|-------------------|----------------| | 1Cr13 | Quenching & Tempering | ≥345 | 540 | 25 | 55 | 78 | ≥159 | | 1Cr12 | Quenching & Tempering | ≥440 | 615 | 20 | 60 | 71 | 187–229 | | 2Cr13 | Quenching & Tempering | ≥490 | 655 | 16 | 50 | 63 | 207–241 | | 1Cr12Mo | Quenching & Tempering | ≥550 | 685 | 18 | 60 | 78 | 217–248 | | 1Cr11MoV | Quenching & Tempering | ≥490 | 685 | 16 | 55 | 47 | 269–302 | | 1Cr12W1MoV | Quenching & Tempering | ≥590 | 735 | 15 | 45 | 47 | 269–302 | | 2Cr12MoV | Quenching & Tempering | ≥600 | - | 15 | 50 | 47 | 241–285 | | 2Cr12Ni1Mo1W1V | Quenching & Tempering | ≥735 | 880 | 14 | 42 | 47 | ≤255 | | 2Cr12NiMo1W1V | Quenching & Tempering | ≥760 | 930 | 12 | 32 | - | 277–311 | | 0Cr17Ni4Cu4Nb | Precipitation Treat. | 590–755 | 890 | 16 | 55 | - | 262–302 | | | (II) | 890–980 | 950–1020 | 16 | 55 | - | 293–321 | | | (III) | 755–800 | 890–1030 | 16 | 55 | - | 277–311 | **Notes:** 1. Test samples are 25 mm in size. 2. Mechanical properties apply to steels with cross-sectional dimensions ≤ 60 mm. 3. These materials are suitable for manufacturing steam turbine and gas turbine blades. For more information, visit [www.chinawj.com.cn](http://www.chinawj.com.cn) Editor: Hardware Business Network Information Center

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