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GB9948 Petroleum Cracking Seamless Steel Tubes 10#20# 12CrMo 15CrMo 12Cr1MoV 07Cr19Ni10

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GB9948 Petroleum Cracking Seamless Steel Tubes 10#20# 12CrMo 15CrMo 12Cr1MoV 07Cr19Ni10

Country/Region	china
City & Province	ningbo zhejiang
Categories	Metal Casting Machinery

Product Details

Product name: GB 9948 Material10#20# 12CrMo 15CrMo 12Cr1MoV Petroleum Cracking Seamless Steel Tubes

Out Diameter: 3~500mm

Wall Thickness: 0.5~50mm

Application: It is used for the seamless steel tubes for furnace,heat exchangers, Petroleum Cracking etc.

Table1 The Tolerances of Outer Diameter and Wall Thickness Unit:mm

Sort Code	Manufacuring Method	Nominal Size		Tolerances
				Common Level	High Level
W-H	Hot Rolling (Extrusion)	Outer Diameter D	≤54	±0.50	±0.30
			＞54~325	±1%D	±0.75%D
			＞325	±1%D	-
		Wall Thicknass S	≤20	+15%S -10%S	±10%S
			＞20	+12.5%S -10%S	±10%S
	Hot Expand	Outer Diameter D	All	±1%D
		Wall Thicknass S	All	±15%S
W-C	Cold Drawn(Rolling)	Outer Diameter D	≤25.4	±0.15
			＞25.4~40	±0.20
			＞40~50	±0.25
			＞50~60	±0.30
			＞60	±0.75%D	±0.5%D
		Wall Thicknass S	≤3.0	±0.3	±0.2
			＞3.0	±10%S	±7.5%S

Table2 The Tolerance of Minimum Wall Thickness Unit :mm

Sort Code	Manufacturing Method	Minimum Wall Thickness S_min	Tolerance
			Common Level	High Level
W-H	Hot Rolling(Extrusion)	≤4.0	+0.90 0	+0.70 0
		＞4.0	+25%S_min 0	+22%S_min 0
W-C	Cold Drawn(Rolling)	≤3.0	+0.6 0	+0.4 0
		＞3.0	+20%S_min 0	+15%S_min 0

Table3 Steel grade and chemical composition

Steel grade

Chemical composition %

≤

0.07~

0.13

0.17~

0.37

0.35~

0.65

≤0.15

≤

0.25

—

≤0.08

≤0.20

0.025

0.015

0.17~

0.23

0.17~

0.37

0.35~

0.65

≤0.25

≤0.15

≤

0.25

—

≤0.08

≤0.20

0.025

0.015

12CrMo

0.08~

0.15

0.17~

0.37

0.40~

0.70

0.40~

0.70

0.40~

0.55

≤

0.30

—

≤0.20

0.025

0.015

15CrMo

0.12~

0.018

0.17~

0.37

0.40~

0.70

0.80~

1.10

0.40~

0.55

≤

0.30

—

≤0.20

0.025

0.015

12CrlMo

0.08~

0.15

0.50~

1.00

0.30~

0.60

1.00~

1.50

0.45~

0.65

≤

0.30

—

≤0.20

0.025

0.015

12CrlMoV

0.08~

0.15

0.17~

0.37

0.40~

0.70

0.90~

1.20

0.25~

0.35

≤

0.30

—

0.15~

0.30

≤0.20

0.025

0.015

12Cr2Mo

0.08~

0.15

≤0.50

0.40~

0.60

2.00~

2.50

0.90~

1.13

≤

0.30

—

≤0.20

0.025

0.015

12Cr5MoI

12Cr5MoNT

≤

0.15

≤0.50

0.30~

0.60

4.00~

6.00

0.45~

0.60

≤

0.60

—

≤0.20

0.025

0.015

12Cr9MoI

12Cr9MoNT

≤

0.15

0.25~

1.00

0.30~

0.60

8.00~

10.00

0.90~

1.10

≤

0.60

—

≤0.20

0.025

0.015

07Cr19Ni10

0.04~

0.10

≤

1.00

≤2.00

18.00~

20.00

—

8.00~

11.00

—

0.030

0.015

07Cr18Ni11Nb

0.04~

0.10

≤

1.00

≤2.00

17.00~

19.00

—

9.00~

12.00

8C~

1.10

—

0.030

0.015

07Cr19Ni11NTi

0.04~

0.10

≤0.75

≤2.00

17.00~

20.00

—

9.00~

13.00

—

4C~

0.60

—

0.030

0.015

022Cr17Ni12Mo2

≤

0.30

≤1.00

≤2.00

16.00~

18.00

2.00~

3.00

10.00~

14.00

—

0.030

0.015

Table4 Heat Treatment Standard

Steel Grade	Heat Treatment Standard
10^a	Normalizing；At Temperature 880℃~940℃
20^a	Normalizing:At Temperature 880℃~940℃
12CrMo^b	Normalizing:At Temperature 900℃~960℃ Tempering:At Temperature 670℃~730℃
15CrMo^b	Normalizing:At Temperature 900℃~960℃ Tempering:At Temperature 680℃~730℃
12Cr1Mo^b	Normalizing:At Temperature 900℃~960℃ Tempering:At Temperature 680℃~750℃
12Cr1MoV^b	S≤30mm:Normalizing:At Temperature 980℃~1020℃ Tempering:At Temperature 720℃~760℃ S＞30mm:Quenching:At Temperature 950℃~990℃ Tempering:At Temperature 720℃~760℃ Or Normalizing:At Temperature 980℃~1020℃ (rapid cooling after Normalizing) Tempering:At Temperature 720℃~760℃
12Cr2Mo^b	S≤30mm:Normalizing:At Temperature 900℃~960℃ Tempering:At Temperature 700℃~750℃ S＞30mm:Quenching:At Temperature ≥ 900℃ Tempering:At Temperature 700℃~750℃ Or Normalizing:At Temperature 900℃~960℃ (rapid cooling after Normalizing) Tempering:At Temperature 700℃~750℃
12Cr5MoI	Full Annealing or isothermal annealing
12Cr5MoNT	Normalizing:At Temperature 930℃~980℃ Tempering:At Temperature 730℃~770℃
12Cr9MoI	Full Annealing or isothermal annealing
12Cr9MoNT	Normalizing:At Temperature 890℃~950℃ Tempering:At Temperature 720℃~800℃
07Cr19Ni10	Treatment with solid solving:At Temperature ≥ 1040℃ (rapid cooling after Treatment)
07Cr18Ni11Nb	Treatment with solid solving: For Hot Rolled Tube At Temperature ≥ 1050℃ For Cold Drawn(rolled)Tube At Temperature ≥ 1100℃ (rapid cooling after Treatment)
07Cr19Ni11Ti	Treatment with solid solving: For Hot Rolled Tube At Temperature ≥ 1050℃ For Cold Drawn(rolled)Tube At Temperature ≥ 1100℃ (rapid cooling after Treatment)

Table5 Mechanical Property

Steel Grade	Tensile Strength R_m/MPa	Lower yield strength R_p0.2/MPa	Elongation A/％		Shock absorption KV₂/J		Brinell hardness
		Lower yield strength R_p0.2/MPa	Longitudinal direction	Transverse	Longitudinal direction	Transverse	Brinell hardness
		≥					≤
10	335~475	205	25	23	40	27	-
20	410~550	245	24	22	40	27	-
12CrMo	410~560	205	21	19	40	27	156HBW
15CrMo	440~640	295	21	19	40	27	170HBW
12Cr1Mo	415~560	205	22	20	40	27	163HBW
12Cr2MoV	470~640	255	21	19	40	27	179HBW
12Cr2Mo	450~600	280	22	20	40	27	163HBW
12Cr5MoI	415~590	205	22	20	40	27	163HBW
12Cr5MoNT	480~640	280	20	18	40	27	-
12Cr9MoI	460~640	210	20	18	40	27	179HBW
12Cr9MoNT	590~740	390	18	16	40	27	-
07Cr19Ni10	≥520	205	35		-	-	187HBW
07Cr18Ni11Nb	≥520	205	35		-	-	187HBW
07Cr19Ni11Ti	≥520	205	35		-	-	187HBW
022Cr17Ni12Mo2	≥485	170	35		-	-	187HBW
If the wall thickness of the tube is less than 5mm, doesn’t have to do the hardness test

Table6 Impact energy absorption attenuation factor of small sample

Specimen	Specimen size(heightXwidth)mm	Attenuation factor
Standard sample	10X10	1.00
Small sample	10X7.5	0.75
Small sample	10X5	0.50

Table7 Diameter flaring rate of steel tubes

Steel	Diameter flaring rate of steel tubes/%
	ID/OD
	≤0.6	＞0.6~0.8	＞0.8
Carbon structural steel	10	12	17
Alloy structural steel	8	10	15
Stainless(heat resistance)steel	12	15	20

Table8 Testing items and sampling quantity of steel tubes

Number	Testing items	Sampling quantity
1	Chemical composition	1 sample from each furnace
2	Tensile test	1 sample from each of two steel tubes on each batch
3	Hardness test	3 samples taken on 2 steel tubes on each batch
4	Impact test	All
5	Hydraulic test	1 sample from each of two steel tubes on each batch
6	Flattening test	2 samples taken on 2 steel tubes on each batch
7	Bending test	1 sample taken on 2 steel tubes on each furnace
8	Flaring test	2 samples taken on 2 steel tubes on each batch
9	Macroscopic examination	1 sample taken on 2 steel tubes on each furnace
10	Non-metallic inclusions	1 sample taken on 2 steel tubes on each furnace
11	Eddy current testing	All
12	Magnetic flux leakage detection	All
13	Ultrasonic testing	All
14	Intergranular corrosion test	1 sample from each of two steel tubes on each batch

Table A.1 Comparison Table of Similar Steel Grade

No.	GB	Similar Steel Grade
No.	GB	ISO	EN	ASTM/ASME	JIS
1	10	-	P195GH	A	STB 340
2	20	PH26	P235GH	A-1,B	STB 410
3	12CrMo	-	-	T2/P2	STBA 20
4	15CrMo	13CrMo4-5	13CrMo4-5	T12/P12	STBA 22
5	12Cr1Mo	-	10CrMo5-5	T11/P11	STBA 23
6	12Cr1MoV	-	-	-	-
7	12Cr2Mo	10CrMo9-10	10CrMo9-10	T22/P22	STBA 24
8	12Cr5Mo-I	X11CrMo9-1TA	X11CrMo5+I	T5/P5	STBA 25
9	12Cr5Mo-NT	-	X11CrMo5+NT	T5/P5	STBA 25
10	12Cr9Mo-I	X11CrMo9-1TA	X11CrMo9-1+I	T9/P9	STBA 26
11	12Cr9Mo-NT	-	X11CrMo9-1+NT	T9/P9	STBA 26
12	07Cr19Ni10	X7CrNi18-9	X6CrNi18-10	TP304H	SUS 304H TB
13	07Cr18Ni11Nb	X7CrNiNb18-10	X7CrNiNb18-10	TP347H	SUS 347H TB
14	07Cr19Ni11Ti	-	X6CrNiTi18-10	TP321H	SUS 321H TB
15	022Cr17Ni12Mo2	-	X2CrNiMo17-12-2	TP316L	SUS 316L TB

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