1. Wsd690e steel plate introduction:
Wsd690e belongs to low welding crack sensitive steel plate, w refers to the first letter at the beginning of Wuyang Steel, and SD is the first capital letter at the beginning of hydropower. E represents the grade of steel plate, and the impact temperature is - 40 ° C.
Wsd690e is a special 800MPa high strength steel for diversion penstock of hydropower station developed by Wuyang Iron and steel company in China. The steel plate is delivered in quenched and tempered state, with fine-grained tempered sorbite + flexure structure.
2. Wsd690e steel plate features: corrosion resistance, high strength resistance, low temperature crack resistance sensitivity, high toughness, good weldability.
3. Chemical composition (melting analysis) of wsd690e steel plate WT,%:
Brand csimnp svcr Ni Cu Mo B
WSD690E ≤ 0.18 ≤ 0.5 ≤ 1.5   ≤ 0.02  ≤ 0.01 ≤ 0.08 ≤ .0.8  ≤ 1.5 ≤ 0.5 ≤ 0.6 ≤ 0.005
A. the allowable deviation of chemical composition of finished steel plate shall comply with the provisions of GB / t2222.
B smelting carbon equivalent CEQ ≤ 0.53%. The sensitivity coefficient of smelting crack PCM ≤ 0.30%
Ceq(%)=C+Mn/6+Si/24+Ni/40+Cr/5+Mo/4+V/14
Pcm(%)=C+Si/30+Mn/20+Cu/20+Ni60+Cr/20+Mo/15+V/15+v/10+5B
4. Mechanical properties of steel plate
Thickness yield tensile extension temperature impact absorption energy 5% strain aging impact energy aks / J 180 ° bending d = 3A
80 690770-930 15-40 average 47 single 34-20 average 47 single 34 intact
>80-120 》670 750-920
Note: the Charpy V-shaped impact (including aging impact) test results are calculated according to the arithmetic mean value of three samples, and the value of one sample is allowed to be lower than the value specified in the above table, but not lower than 70% of the specified value.
5. Wsd690e steel plate application:
Wsd690e steel plate is a kind of steel for water and electricity, which can be used as steel for large-scale natural gas spherical tank, oxygen (including nitrogen and argon) spherical tank, penstock of hydropower station and spiral case of hydropower unit.
Six characteristics of Wugang steel for hydropower:
1. High purity of steel: the gas content of inclusions P, s, h, O and N in steel is strictly controlled.
2. Ideal strength reserve: the level of yield strength and tensile strength is controlled moderately, and the surplus is usually 50-80mpa.
3. Reasonable yield ratio control: by adjusting the composition and improving the technology, the yield ratio is more reasonable.
4. Excellent low temperature toughness: the steel has excellent low temperature toughness and sufficient toughness reserve, so there is no need to worry about brittle failure.
5. Excellent welding energy: through improving smelting process, adjusting the amount of alloy in steel, further reducing CEQ and PCM values. Good welding performance.
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