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Steel Plate For Hydropower Station

SX780CF Steel for Large Hydropower Project in Wugang

Brand: SX780CF

Steel Plant: Wuyang Iron and Steel Co., Ltd.

SX780CF Technical Standard: Three Gorges Enterprise Standard

Introduction of SX780CF

SX780CF is a steel with high strength and low crack sensitivity for large-scale hydropower projects. It can be produced by Wuyang Steel Works in China and belongs to the brand of Ministry of Science and Technology of Wuyang Steel Works. It is mainly used for manufacturing spiral case, penstock and other important structural parts of large hydroelectric generating units and high head storage power stations with installed capacity of more than 10 million kilowatts. It needs high strength and toughness, good cold deformation and weldability. Equipment manufacturing requires high strength and weldability. Because of the special use environment of hydropower steel, the strength, toughness, weldability and corrosion resistance of steel plate are very strict.

Chemical Constituents of SX780CF

牌号

板厚mm

化学成分%(质量分数)

C

Si

Mn

P

S

Cr

Ni

Mo

Cu

V

B

SX780CF

≤80

≤0.09

≤0.5

0.7~1.50

≤0.015

≤0.005

≤0.6

0.5~1.50

≤0.7

≤0.5

≤0.5

≤0.004

80~≤120

≤0.10

120~150

≤0.11

≤0.5

0.7~1.50

≤0.015

≤0.005

≤0.7

0.8~1.80

≤0.7

≤0.5

≤0.5

≤0.004

Mechanical properties of SX780CF

牌号

板厚mm

力学性能a横向

工艺性横向

屈服强度Rp0.2MPa

抗拉强度RmMPa

断后伸长率bA%

冲击吸收能量c

5%应变时效后冲击吸收能量c

冷弯

SX780CF





试验温度

KV2J

试验温度

KV2J

a=180°b=2a D=3a

≤80

≥690

770~930

≥15

40

≥100

20

≥100

外表面无裂纹

80~≤120

≥670

750~920

≥15

40

≥100

20

≥100

120~150

≥650

740~900

≥15

40

≥100

20

≥100

SX780CF Production Process

1. Raw materials (scrap, pig iron and molten iron)

2. Electric Furnace (100 ton EAF smelting), Converter

3. Refining treatment of molten steel in LF furnace

4. Vacuum treatment of molten steel in VD or VOD furnaces

5. Mold casting (multiple key die casting lines) or continuous casting (large slab caster); (1 ingot remelting 50 tons slab electroslag furnace)

6. Heating (continuous and soaking furnaces)

7. Steel plate rolling (4100 and 4200 mm mills)

8. Heat treatment of steel plate (normalizing tempering and tempering)

9. Inspection of steel plate cutting

10. Warehousing


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