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You are here : section steel--Katalor steel > Flat-Bulb Steel for shipbuilding > 正文NK B bulb flat steel

NK B bulb flat steel

NK B bulb flat steel

bulb flat steel is a kind of special section steel, made up with flat web and spherical ball head, it is asymmetric steel. bulb flat steel mainly used to build ship and bridge, but with the rapid development of shipbuilding industry, bulb flat steel become the name of shipbuilding bulb flat steel, it is one of the most important steel in shipbuilding section steel, used as the strengthening rib of the shipbuilding steel plate.

Nowadays, the standard of Chinese bulb flat steel is GB/T 9945-2012 ”Hot-rolled bulb flat steels“, which has same product size with EN10067:1996 “Hot rolled bulb flat steels”. Please click here to find the size information.

NK B bulb flat steel is a normal strength hull structural steel, below is the technique data of NK GRADE B bulb flat steel.

Chemical Composition of NK GRADE B bulb flat steel

Grade	Chemical Composition %
Grade	C	Si	Mn	P	S	Cu	Cr	Ni
NK B	≤0.21	≤0.35	≥0.60	≤0.035	≤0.035	≤0.35	≤0.30	≤0.30

Mechanical Properties of NK GRADE B bulb flat steel

Grade

Tensile Test

Impact Energy KV2/J

Yield Strength ReH/Mpa

Tensile Strength Rm/Mpa

Elongation A/%

Temperature

℃

Longitudinal

Transverse

NK B

≥235

400-520

≥22

≥27

≥20

Katalor enterprises have large quantities of bulb flat steel in stock, in different grade and different size. We can supply Grade B bulb flat steel with certification of Nine Classification Society, such as LR, BV, ABS, DNV, RINA, NK, KR, GL, CCS, and so on.

If you need NK GRADE B bulb flat steel, welcome to contact us.