Stainless steel seamless pipe is a hollow section, no seams around the strip steel. The wall is thicker, it is more economical and practical, the wall thickness of the thinner, processing costs will be substantially increased it;
the product process to determine its performance limitations, generally low precision seamless steel pipe: uneven thickness, the appearance of low brightness tube length into this is high, and the inner surface pitting and black spots difficult to remove; detection and plastic must be processed offline. Therefore, it shows its superiority in high pressure, high strength and mechanical structure.
1、Standard size for stainless seamless steel pipe
|
Inch
|
DN
(mm)
|
OD
(mm)
|
SCH5S
|
SCH10S
|
SCH10
|
SCH20
|
SCH30
|
SCH40
|
SCH60
|
SCH80
|
SCH100
|
SCH120
|
----
|
|
1/8
|
DN6
|
10.3
|
|
1.24
|
|
|
|
1.73
|
|
2.42
|
|
|
|
|
1/4
|
DN8
|
13.7
|
|
1.65
|
|
|
|
2.24
|
|
3.02
|
|
|
|
|
3./8
|
DN10
|
17.1
|
|
1.65
|
|
|
|
2.31
|
|
3.2
|
|
|
|
|
1/2
|
DN15
|
21.3
|
1.65
|
2.11
|
|
|
|
2.77
|
|
3.73
|
|
|
|
|
3/4
|
DN20
|
26.7
|
1.65
|
2.11
|
|
|
|
2.87
|
|
3.91
|
|
|
|
|
1
|
DN25
|
33.4
|
1.65
|
2.77
|
|
|
|
3.38
|
|
4.55
|
|
|
|
|
1 1/4
|
DN32
|
42.2
|
1.65
|
2.77
|
|
|
|
3.56
|
|
4.85
|
|
|
|
|
1 1/2
|
DN40
|
48.3
|
1.65
|
2.77
|
|
|
|
3.68
|
|
5.05
|
|
|
|
|
2
|
DN50
|
60.3
|
1.65
|
2.77
|
|
|
|
3.91
|
|
5.54
|
|
|
|
|
2 1/2
|
DN65
|
73.0
|
2.11
|
3.05
|
|
|
|
5.16
|
|
7.01
|
|
|
|
|
3
|
DN80
|
88.9
|
2.11
|
3.05
|
|
|
|
5.49
|
|
7.62
|
|
|
|
|
3 1/2
|
DN90
|
101.6
|
2.11
|
3.05
|
|
|
|
5.74
|
|
8.08
|
|
|
|
|
4
|
DN100
|
114.3
|
2.11
|
3.05
|
|
|
|
6.02
|
|
8.58
|
|
11.13
|
|
|
5
|
DN125
|
141.3
|
2.77
|
3.4
|
|
|
|
6.55
|
|
9.53
|
|
12.7
|
|
|
6
|
DN150
|
168.3
|
2.77
|
3.4
|
|
|
|
7.11
|
|
10.97
|
|
14.27
|
|
|
8
|
DN200
|
219.1
|
2.77
|
3.76
|
|
6.35
|
7.04
|
8.18
|
10.31
|
12.7
|
15.09
|
18.26
|
|
|
10
|
DN250
|
273.1
|
3.40
|
4.19
|
|
6.35
|
7.8
|
9.27
|
12.7
|
15.09
|
18.26
|
21.44
|
|
|
12
|
DN300
|
323.9
|
3.96
|
4.57
|
|
6.35
|
8.38
|
10.31
|
14.27
|
17.48
|
21.44
|
25.4
|
|
|
14
|
DN350
|
355.5
|
3.96
|
4.78
|
6.35
|
7.92
|
9.53
|
11.13
|
15.09
|
19.05
|
23.83
|
27.79
|
|
|
----
|
|
|
|
|
|
|
|
|
|
|
|
|
|
2、Produced standard
GB2270-80:Usually for common stainless seamless pipe standard.
GB/T14976-94: Stainless seamless steel pipe for fluid delivery.
GB/T14975-94: Stainless steel seamless steel pipe for structure.
GB13296-91: Stainless steel seamless steel tubes for boilers and heat ex-changer.
(GJB2608-96)(YB676-73): Aerospace structure steel thick wall seamless steel pipe.
(GJB2296-95)(YB678-71): Stainless seamless steel pipe for aviation.
GB3089-92: Stainless acid resistant and extremely thin wall seamless steel pipe.
GB9948-88: Seamless steel pipe for petroleum cracking.
(YB/T679-97)(YB679-71): Aerospace 18A hollow rivet thin wall seamless steel
Pipe.
(GJB2609-96)(YB680-71): Thin wall seamless steel pipe for aviation structure.
(YB/T681-97)(YB681-71): 20A thin wall seamless steel pipe for aviation use.
GB3090-82: Stainless steel small diameter steel pipe．
GB5310-95: Seamless steel tube for high pressure boiler.
GB3087-82: Low and medium pressure seamless steel pipe.
ASTM A213: Ferrite and austenitic alloy steel seamless steel tubes for boilers and heat ex-changers.
ASTM A269: General purpose austenitic stainless steel seamless steel pipe and welded steel pipe.
ASTM A312 : Austenitic stainless steel seamless steel pipe welded steel pipe．
ASTM A450：General requirements for carbon, Ferritic and austenitic alloy steel.
ASTM A530：General requirements for Ferritic and alloy steels
for specialized purposes．
ASTM A789：Austenitic stainless steel seamless steel pipe and welded steel pipe．
JIS G3456-88：Stainless steel tube for mechanical structure．
JIS G3448-88：Stainless steel tubes for ordinary pipes．
JIS G3459-88：Pipe with stainless steel pipe．
JIS G3463-88：Stainless steel tube for boiler and heat ex-changer．
Q/HYAD：Seamless steel pipe for chemical industry．
Commonly available processed grade
|
GRADE
|
GB/T 1220-2007
|
|
ASTM
|
UNS
|
|
DIN
|
|
JIS
|
|
KS
|
|
奥氏体不锈钢
（Austenitic）
|
12Cr17Mo6Ni5N
|
|
201
|
S20100
|
|
1.4372
|
|
SUS201
|
|
STS201
|
|
06Cr19Ni10
|
|
304
|
S30400
|
|
1.4301
|
|
SUS304
|
|
STS304
|
|
022Cr19Ni10
|
|
304L
|
S30403
|
|
1.4306
|
|
SUS304L
|
|
STS304L
|
|
06Cr23Ni13
|
|
309S
|
S30908
|
|
1.4833
|
|
SUS309S
|
|
STS309S
|
|
06Cr25Ni20
|
|
310S
|
S31008
|
|
1.4845
|
|
SUS310S
|
|
STS310S
|
|
022Cr17Ni12Mo
|
|
316L
|
S31603
|
|
1.4404
|
|
SUS316L
|
|
STS316L
|
|
06Cr19Ni11Ti
|
|
321
|
S32100
|
|
1.4541
|
|
SUS321
|
|
STS321
|
|
双相不锈钢
(Duplex)
|
022Cr23Ni5Mo3
|
|
2205
|
S31803/S32205
|
|
1.4462
|
|
-
|
|
-
|
|
25Cr-7Ni-4Mo-0.27N
|
|
2507
|
S32750
|
|
1.4410
|
|
-
|
|
-
|
Chemical composition and Mechanical properties
|
牌号
Grade
|
C(%)
|
Si(%)
|
Mn(%)
|
P(%)
|
S(%)
|
Cr(%)
|
Ni(%)
|
N(%)
|
Mo(%)
|
|
奥氏体不锈钢
（Austenitic
|
304
|
≤0.08
|
≤1.00
|
≤2.00
|
≤0.045
|
≤0.03
|
18.00-20.00
|
8.00-10.50
|
≤1.00
|
-
|
|
304L
|
≤0.03
|
≤1.00
|
≤2.00
|
≤0.045
|
≤0.03
|
18.00-20.00
|
8.00-12.00
|
≤1.00
|
-
|
|
321
|
≤0.08
|
≤1.00
|
≤2.00
|
≤0.045
|
≤0.03
|
17.00-19.00
|
9.00-12.00
|
≤1.00
|
-
|
|
316L
|
≤0.03
|
≤1.00
|
≤2.00
|
≤0.045
|
≤0.03
|
16.00-18.00
|
10.00-14.00
|
≤1.00
|
2.00-3.00
|
|
309S
|
≤0.08
|
≤1.00
|
≤2.00
|
≤0.045
|
≤0.03
|
22.00-24.00
|
12.00-15.00
|
-
|
-
|
|
310S
|
≤0.08
|
≤1.50
|
≤2.00
|
≤0.045
|
≤0.03
|
24.00-26.00
|
19.00-22.00
|
-
|
-
|
|
双相不锈钢
(Duplex)
|
2205
|
≤0.03
|
≤1.00
|
≤2.00
|
≤0.03
|
≤0.02
|
22.00-23.00
|
4.50-6.50
|
0.14-0.20
|
3.00-3.50
|
|
2507
|
≤0.03
|
≤0.80
|
≤1.20
|
≤0.035
|
≤0.02
|
24.00-26.00
|
6.00-8.00
|
0.24-0.32
|
3.00-3.50
|
|
牌号
Grade
|
TS
(Mpa)
|
YS
(Mpa)
|
EL
( %)
|
Rate of reduction in area
(%)
|
Density
(g/cm³）
|
Hardness
(HB / HRB / HV)
|
|
奥氏体
Austenitic
|
201
|
≥520
|
≥275
|
50-60
|
≥60
|
7.93
|
≤187HB / ≤90HRB / ≤200HV
|
|
304
|
515-1035
|
≥205
|
≥40
|
≥60
|
7.93
|
≤201HBW / ≤92HRB / ≤210HV
|
|
304L
|
≥520
|
≥205
|
≥40
|
≥60
|
7.93
|
≤187HB / ≤90HRB / ≤200HV
|
|
321
|
≥520
|
≥205
|
≥50
|
≥40
|
7.98
|
≤187HB / ≤90HRB / ≤200HV
|
|
316L
|
≥480
|
≥177
|
≥40
|
≥60
|
7.98
|
≤187HB / ≤90HRB / ≤200HV
|
|
309S
|
≥515
|
≥205
|
≥40
|
≥50
|
7.98
|
≤187HB
|
|
310S
|
≥515
|
≥205
|
≥40
|
≥50
|
7.98
|
≤187HB
|
|
双相不锈钢
(Duplex)
|
2205
|
≥620
|
≥205
|
≥25
|
≥50
|
8.24
|
25-35HRC
|
|
2507
|
800-1000
|
≥550
|
≥25
|
|
8.24
|
≤32HRC / ≤290HV
|
3、Hot sell seamless pipe grade
duplex stainless steel 2205 is composed of 21% chromium, 2.5% molybdenum and 4.5% nickel nitrogen alloy consisting of duplex stainless steel. It has high strength, good impact toughness and good overall and local resistance to stress corrosion. 2205 stainless steel and 304 316L austenitic stainless steel, mechanical properties, compared to the more dominant advantage, more and more industries have just started to choose 2205 duplex stainless steel as an industrial pipe.
Chemical composition and physical properties
|
Grade
|
C(%)
|
Si(%)
|
Mn(%)
|
Cr(%)
|
P(%)
|
S(%)
|
N（%)
|
Ni(%)
|
Mo(%)
|
|
2205
|
≤0.30
|
≤1.00
|
≤2.00
|
21.00-23.00
|
≤0.040
|
≤0.020
|
≤0.20
|
4.5-6.5
|
2.5-3.5
|
|
Grade
|
TS
(Mpa)
|
YS
(Mpa)
|
EL
(%)
|
|
2205
|
≥620
|
≥205
|
≥25
|
The advantage of 2205 duplex seamless pipe
High strength, good impact toughness
Good overall and local corrosion resistance.
Resistance to chloride stress corrosion, pitting corrosion, crevice corrosion
Yield strength is two times of austenitic stainless steel.
Application
Industrial sewage treatment pipe
Industrial water heat ex changer containing hydrogen chloride, condensation container
Industrial water heat ex changer containing sulfide hydrogen, condensing container
