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1. Application scope : this technology conditions apply to manufacture the steam turbine baffle ring, less than 150 mm thickness of B61N-S steel plates.
2. Of the steel plate size and shape, weight and deviation should be allowed to meet the provisions of GB709-88.
3. Technical requirements
3.1 the chemical composition of the steel plate (melting analysis) should be in accordance with table 1:
Chart 1 Chemical composition analysis (melting analysis)
Wt％
|
C |
Si |
Mn |
P |
S |
Ni |
Cr |
Mo |
V |
|
0.10～0.16 |
≤0.40 |
0.40～0.80 |
≤0.030 |
≤0.030 |
≤0.50 |
0.80～1.20 |
0.80～1.20 |
0.15～0.30 |
3.2 delivery status: normalized and backfiring
3.3 the mechanical properties of the steel plate should comply with the provisions of the table 2
Chart 2 mechanical properties
|
σs MPa |
σb MPa |
δ50 ％ |
ψ ％ |
Normal horizontalAKU J |
|
≥314 |
≥490 |
≥15 |
≥30 |
≥30 |
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