Chinese Professional Steel Pipe Q235 - Specification for Casing and Tubing API SPECIFICATION 5CT NINTH EDITION-2012 – Sanonpipe

Product Detail

Overview

Application

Api5ct Oil Casing Is Mainly Used To Transport Oil, Natural Gas, Gas, Water And Other Liquids And Gases

Main Grade

Grade :J55,K55,N80,L80,P110, etc

Chemical Component

Grade	Type	C		Mn		Mo		Cr		Ni	Cu	P	s	Si
Grade	Type	min	max	min	max	min	max	min	max	max	max	max	max	max
1	2	3	4	5	6	7	8	9	10	11	12	13	14	15
H40	—	—	—	—	—	—	—	—	—	—	—	—	0.030	—
J55	—	—	—	—	—	—	—	—	—	—	—	—	0.030	—
K55	—	—	—	—	—	—	—	—	—	—	—	—	0.030	—
N80	1	—	—	—	—	—	—	—	—	—	—	0.030	0.030	—
N80	Q	—	—	—	—	—	—	—	—	—	—	0.030	0.030	—
R95	—	—	0.45 c	—	1.90	—	—	—	—	—	—	0.030	0.030	0.45
L80	1	—	0.43 a	—	1.90	—	—	—	—	0.25	0.35	0.030	0.030	0.45
L80	9Cr	—	0.15	0.3	0.60	0 90	1.10	8.00	10.0	0.50	0.25	0.020	0.030	1.00
L80	13Cr	0.15	0.22	0.25	1.00	—	—	12.0	14.0	0.50	0.25	0.020	0.030	1.00
C90	1	—	0.35	—	1.20	0.25 b	0.85	—	1.50	0.99	—	0.020	0.030	—
T95	1	—	0.35	—	1.20	0.25 b	0.85	0 40	1.50	0.99	—	0 020	0.010	—
C110	—	—	0.35	—	1.20	0.25	1.00	0.40	1.50	0.99	—	0.020	0.005	—
P1I0	e	—	一	—	—	—	—	—	—	—	—	0.030 e	0.030 e	—
QI25	1	—	0.35		1.35	—	0.85	—	1.50	0.99	—	0.020	0.010	—
NOTE Elements shown shall be reported in product analysis
a The carbon content for L80 may be increased up to 0.50% maximum if the product is oil-quenched or polymer-quenched.
b The molybdenum content for Grade C90 Type 1 has no minimum tolerance if the wall thickness is less than 17.78 mm.
c The carbon contect for R95 may be increased up to 0.55% maximum if the product is oil-quenched.
d The molybdenum content for T95 Type 1 may be decreased to 0.15% minimum if the wall thickness is less than 17.78 mm.
e For EW Grade P110, the phosphorus content shall be 0.020% maximum and the sulfur content 0.010% maximum.

Mechanical Property

Grade	Type	Total Elongation Under Load	Yield Strength MPa		Tensile Strength min MPa	Hardness ^a,c max		Specified Wall Thickness	Allowable Hardness Variation ^b

			min	max		HRC	HBW	mm	HRC
H40	—	0.5	276	552	414	—	—	—	—
J55	—	0.5	379	552	517	—	—	—	—
K55	—	0.5	379	552	655	—	—	—	—
N80	1	0.5	552	758	689	—	—	—	—
N80	Q	0.5	552	758	689	—	—	—	—
R95	—	0.5	655	758	724	—	—	—	—
L80	1	0.5	552	655	655	23.0	241.0	—	—
L80	9Cr	0.5	552	655	655	23.0	241.0	—	—
L80	l3Cr	0.5	552	655	655	23.0	241.0	—	—
C90	1	0.5	621	724	689	25.4	255.0	≤12.70	3.0
								12.71 to 19.04	4.0
								19.05 to 25.39	5.0
								≥25.4	6.0
T95	1	0.5	655	758	724	25.4	255	≤12.70	3.0
								12.71 to 19.04	4.0
								19.05 to 25.39	5.0
								≥25.4	6.0
C110	—	0.7	758	828	793	30.0	286.0	≤12.70	3.0
								12.71 to 19.04	4.0
								19.05 to 25.39	5.0
								≥25.4	6.0
P110	—	0.6	758	965	862	—	—	—	—
Q125	1	0.65	862	1034	931	^b	—	≤12.70	3.0
								12.71 to 19.04	4.0
								19.05	5.0
^a In case of dispute, laboratory Rockwell C hardness testing shall be used as the referee method.
^b No hardness limits are specified, but the maximum variation is restricted as a manufacturing control in accordance with 7.8 and 7.9.
^c For through-wall hardness tests of Grades L80 (all types), C90, T95 and C110, the requirements stated in HRC scale are for maximum mean hardness number.

Test Requirement

In addition to ensuring chemical composition and mechanical properties, hydrostatic tests are performed one by one, and flaring and flattening tests are performed. . In addition, there are certain requirements for the microstructure, grain size, and decarburization layer of the finished steel pipe.