P275NH STEEL PLATE

P275NH,P257NH steel plate,P275NH steel sheet under steel standard EN 10028-3 are mainly used to build pressure vessels and boilers and liquid tanks.For these two pressure vessel steels P275NH and P275NL1,heat treatment for Normalized have to be done for steel plates after production.Boiler steel plate P275NH shall be done low temperature impacting at minus 20 centi degree.For guarantee the usage safety of pressure vessel steel plates,boiler steel plates P275NH would accept ultrasonic examination after rolling.

Technical Requirements & Additional Services for P257NH steel plate:
♦ High tension test
♦ Low temperature impacting test
♦ Simulated post-welded heat treatment (PWHT)
♦ Ultrasonic test under EN 10160,ASTM A435,A577,A578
♦ Issued Orginal Mill test certificate under EN 10204 FORMAT 3.1/3.2
♦ Shot blasting and Painting,Cutting and welding as per end user’s demands 

►Mechnical property for P257NH steel plate:

Thickness(mm)	Yield strength (≥Mpa)	Tensile strength (Mpa)	Elongation in ≥,%
T≤16	275	390-510	24
16<T≤40	265
40<T≤60	255
60<T≤100	235	370-490	23
100<T≤150	225	360-480
150<T	215	350-470

►Chemical composition for P257NH steel plate (Heat Analysis Max%)

Main chemical elements composition of P257NH steel plate
C	Si	Mn	P	S	Al (total)	N	Cr
0.16	0.40	0.80-1.50	0.025	0.015	≥0.020	0.012	0.30
Cu	Mo	Nb	Ni	Ti	V	Nb+Ti+V
0.30	0.08	0.05	0.50	0.03	0.05	0.05