Chemical Composition Requirements for EN10253-2 fittings

Different from EN10253-1, EN10253-2 pipe fittings can be made from a wide range of carbon steel and alloy steel materials. The starting material shall be rigorously selected to suit for different applications at room temperatures, low temperatures, or elevated temperatures. The steel grades designated by EN10253-2 can be further divided as carbon steel, Cr-Mo alloy steel, nickel alloy steel, and line-pipe level alloy steel. Their chemical-composition requirements are listed as below.

EN10253-2 90° Elbow 3D 323.9x7.1 P265GH Type B

1. Chemical requirements for carbon steel EN10253-2 pipe fittings.

GRADE	P235TR2  1.0255	P265TR2  1.0259	P235GH  1.0345	P265GH  1.0425	P355N  1.0562	P355NH  1.0565	P355NL1  1.0566	P215NL  1.0451	P265NL  1.0453
ELEMENT
C	0.16	0.20	0.16	0.20	0.20	0.20	0.18	0.15	0.20
Si	0.35	0.40	0.35	0.40	0.50	0.50	0.50	0.35	0.40
Mn	1.20	1.40	1.20	1.40	0.90~1.70	0.90~1.70	0.90~1.70	0.40~1.20	0.60~1.40
P	0.025	0.025	0.025	0.025	0.025	0.025	0.025	0.025	0.025
S	0.020	0.020	0.020	0.020	0.020	0.020	0.020	0.020	0.020
Al	≥ 0.020	≥ 0.020	≥ 0.020	≥ 0.020	≥ 0.020	≥ 0.020	≥ 0.020	≥ 0.020	≥ 0.020
Cr	0.30	0.30	0.30	0.30	0.30	0.30	0.30	0.30	0.30
Cu	0.30	0.30	0.30	0.30	0.30	0.30	0.30	0.30	0.30
Mo	0.08	0.08	0.08	0.08	0.08	0.08	0.08	0.08	0.08
Nb	0.01	0.01	0.01	0.01	0.05	0.05	0.05	0.10	0.10
Ni	0.30	0.30	0.30	0.30	0.50	0.50	0.50	0.30	0.30
Ti	0.04	0.04	0.04	0.04	0.04	0.04	0.04	0.04	0.04
V	0.02	0.02	0.02	0.02	0.10	0.10	0.10	0.02	0.02
Others	*A	*A	*A	*A	*B	*B	*B	-	-

  *All values are maximum unless otherwise specified.
  *All values are in % by mass for cast analysis. 
  *A denotes that the content of Cr+Cu+Mo+Ni by mass is no larger than 0.70%.
  *B denotes that the content of Nb+Ti+V by mass is no larger than 0.12% while N ≤ 0.02%.
  *The carbon steels are mainly used for pressure purpose at room temperatures.

2. Chemical requirements for Cr-Mo alloy steel EN10253-2 pipe fittings.

GRADE	16Mo3  1.5415	10CrMo5-5  1.7338	13CrMo4-5  1.7335	10CrMo9-10  1.7380	X11CrMo5  1.7362	X11CrMo9-1  1.7386	X10CrMoVNb9-1  1.4903
ELEMENT
C	0.12~0.20	0.15	0.10~0.17	0.08-0.14	0.08-0.15	0.08-0.15	0.08~0.12
Si	0.35	0.50~1.00	0.35	0.50	0.15~0.50	0.25~1.00	0.20~0.50
Mn	0.40~0.90	0.30~0.60	0.40~0.70	0.30~0.70	0.30~0.60	0.30~0.60	0.30~0.60
P	0.025	0.025	0.025	0.025	0.025	0.025	0.020
S	0.020	0.020	0.020	0.020	0.020	0.020	0.010
Al	≤ 0.040	≤ 0.040	≤ 0.040	≤ 0.040	≤ 0.040	≤ 0.040	≤ 0.040
Cr	0.30	1.00~1.50	0.70~1.15	2.00~2.50	4.00~6.00	8.00~10.00	8.00~9.50
Cu	0.30	0.30	0.30	0.30	0.30	0.30	0.30
Mo	0.25~0.35	0.45~0.65	0.40~0.60	0.90~1.10	0.45~0.65	0.90~1.10	0.85~1.05
Nb	-	-	-	-	-	-	0.06~0.10
Ni	0.30	0.30	0.30	0.30	-	-	0.40
Ti	-	-	-	-	-	-	-
V	-	-	-	-	-	-	0.18~0.25
Others	-	-	-	-	-	-	N : 0.030-0.070

   *All values are maximum unless otherwise specified.
  *All values are in % by mass for cast analysis.
  *The Cr-Mo alloy steels are mainly used for pressure purpose at elevated temperature.

3. Chemical requirements for nickel alloy steel EN10253-2 pipe fittings.

GRADE	12Ni14  1.5637	X10Ni9  1.5682
ELEMENT
C	0.15	0.13
Si	0.15~0.35	0.15~0.35
Mn	0.30~0.80	0.30~0.80
P	0.025	0.020
S	0.010	0.010
Al	-	-
Cr	-	-
Cu	0.30	0.30
Mo	-	0.10
Nb	-	-
Ni	3.25~3.75	8.50~9.50
Ti	-	-
V	0.05	0.05
Others	-	-

  *All values are maximum unless otherwise specified.
  *All values are in % by mass for cast analysis.
  *The nickel alloy steels are mainly used for pressure purpose at low temperatures.

4. Chemical requirements for line-pipe high yield EN10253-2 pipe fittings.

GRADE	L290NB  1.0484	L360NB  1.0582	L360QB  1.8948	L415NB  1.8972	L415QB  1.8947	L450QB  1.8952
ELEMENT
C	0.17	0.20	0.16	0.21	0.16	0.16
Si	0.40	0.45	0.45	0.45	0.45	0.45
Mn	1.20	1.60	1.40	1.60	1.60	1.60
P	0.025	0.025	0.025	0.025	0.025	0.025
S	0.020	0.020	0.020	0.020	0.020	0.020
Al	0.015~0.060	0.015~0.060	0.015~0.060	0.015~0.060	0.015~0.060	0.015~0.060
Cr	0.30	0.30	0.30	0.30	0.30	0.30
Cu	0.25	0.25	0.25	0.25	0.25	0.25
Mo	0.10	0.10	0.10	0.10	0.10	0.10
Nb	0.05	0.05	0.05	0.05	0.05	0.05
Ni	0.30	0.30	0.30	0.30	0.30	0.30
Ti	0.04	0.04	0.04	0.04	0.04	0.06
V	0.05	0.15	0.05	0.15	0.08	0.09
Others	*C	*D	*C	*E	*F	*D

  *All values are maximum unless otherwise specified.
  *All values are in % by mass for cast analysis.
  *Used for the connention with API 5L line pipes. The correlations are: 
   L290NB - X42N, L360NB - X52N, L360QB - X52Q, L415NB - X60N,
   L415QB - X60Q, L450QB - X65Q.
  *C: N ≤ 0,012, CEV ≤ 0,42;  D: N ≤ 0,012, V+Nb+Ti ≤ 0,15, CEV ≤ 0,45;
   E: N ≤ 0,012, V+Nb+Ti ≤ 0,15;  F: N ≤ 0,012, V+Nb+Ti ≤ 0,15, CEV ≤ 0,43.