We Super Steel Manufacturing Co.,Ltd(SMC) are amongst the top manufacturers and suppliers for the seamless steel pipe, welded steel pipe, OCTG products and fittings from China. We have been manufacturing and supplying these products to the industry since 1993, and received repeat orders and appreciation from our valued customers.
High quality piping products from approved manufacturers.
In order to continuously improve our offerings to our clients, we have consistently improved and upgraded our manufacturing facility and can hence offer material with stringent requirements.
Over the years, Super Steel Manufacturing Co.,Ltd(SMC) has developed an enviable reputation for project management for the Oil & Gas, Construction, Power Energy, Marine & Offshore, Water Treatment, Exploration & Drilling Services, Pipeline & Petrochemical and other heavy industries.
The many years of experience that we have means that there is always someone who has the ability to carry a project forward.
Always up to date. In this column you can find the steel pipe related articles, including industry trends, product standards and materials, and some technical guidelines.
Pipe Type:Galvanized steel pipe ,Hot Dip Galvanized Round Steel Pipe,Pre Galvanized Steel Pipe
Outer DiameterOD (mm)：
Pre galvanized:21.3-406.4mm
Hot dipped galvanized:21.3mm-610mm
Wall Thickness (mm)：
Pre galvanized:0.6-22mm
Hot dipped galvanized: 0.8- 25mm
Length：LENGTH: 0.3mtr ~ 18mtr, Ramdon Length, Fixed Length, SRL, DRL
MOQ: 1 Ton
Standard and Grade: GB/T 3091 Q195/Q215/Q235/Q345, BS 1387, EN 39, EN 1139 S235JR/S275JR, ASTM A53 GR. A/B/C, JIS G3444 STK 400/STK 500,ASTM A53, EN 10025, EN 10219
Pipe Type: Seamless & Welded Steel Pipe (R
Pipe Type:Galvanized steel pipe ,Hot Dip Galvanized Round Steel Pipe,Pre Galvanized Steel Pipe
Outer DiameterOD (mm)：
Pre galvanized:21.3-406.4mm
Hot dipped galvanized:21.3mm-610mm
Wall Thickness (mm)：
Pre galvanized:0.6-22mm
Hot dipped galvanized: 0.8- 25mm
Length：LENGTH: 0.3mtr ~ 18mtr, Ramdon Length, Fixed Length, SRL, DRL
Standard and Grade: GB/T 3091 Q195/Q215/Q235/Q345, BS 1387, EN 39, EN 1139 S235JR/S275JR, ASTM A53 GR. A/B/C, JIS G3444 STK 400/STK 500,ASTM A53, EN 10025, EN 10219
Pipe Type: Seamless & Welded Steel Pipe (Round/Square/Rectangular)
End:Square Cut/Threaded, Burr Removed
Galvanizing is to make molten metal and iron matrix reaction as an alloy layer, so that the substrate and coating two combined. Galvanizing is to pickle the steel pipe first, in order to remove the iron oxide on the surface of the steel pipe. After pickling , through ammonium chloride or zinc chloride solution or ammonium chloride and zinc chloride mixed aqueous solution tank for cleaning, and then into the hot dip plating tank. Galvanizing has the advantages of uniform coating, strong adhesion and long service life. Widely used in agricultural greenhouses, fire system, gas, water supply, drainage and other fields.
Pipe Type: Seamless & Welded Steel Pipe (Round/Square/Rectangular)
End:Square Cut/Threaded, Burr Removed
Application:
1.Building and structural material
2.Mechanical and general engineering purposes
3.Manufacturing of Bus Body, Railway Boogies
4.In Telephone department as Conduit Pipes
A53 Pipe Materials & Manufacture
Steel materials used to create seamless pipe and welded pipe must be produced via open hearth, electric furnace, basic oxygen, or any combination of these processes. All weld seams in electric-resistance welded A53 Grade B pipe must be heat treated after welding to a minimum of 1,000°F (540°C) to eliminate untempered martensite.
Galvanized A53 Pipe
If ordered galvanized, A53 seamless pipe must be coated inside and out via the hot-dip process. Zinc used for galvanized coatings must conform to Specification B6. The weight of this coating must not be less than 1.8 oz./ft2 (0.55 kg/m2). Test specimens for coating weight testing will be cut in approximately 4” lengths.
Permissible Variation in Wall Thickness
The minimum wall thickness at any point in a length of A53 steel pipe must not be more than 12.5% less than the specified wall thickness.
Permissible Variations in Outside Diameter
For ASTM A53 steel pipe NPS 1-1/2 and smaller, outside diameter must not exceed 1/64” over and 1/32” under specified diameter. For A53 pipe NPS2 and larger, outside diameter must not exceed 1% over and 1% under specified diameter.
Hydrostatic Testing of ASTM A53 Pipe
Separate hydrostatic inspection test pressures are specified for plain end, threaded, and coupled A53 steel pipe. Minimum hydrostatic test pressure for NPS 3 and under is 2,500 psi; minimum test pressure for sizes over NPS 3 is 2,800 psi. Pressure must be maintained for a minimum of 5 seconds, for all sizes.
Mechanical Testing of ASTM A53 Pipe
Electric-resistance welded ASTM A53 steel pipe of NPS 8 and larger must be transverse tested. Sending test (cold) is required for STD and XS-NPS 2 and under, and for XXS-NPS 1-1/4 and under. Flatten testing is required for NPS 2 and larger STD and XS A 53 pipe; flatten testing is not required for XXS pipe.
Hot-dip/cold galvanized steel pipe specification
|
regulation |
grid |
OD mm |
Wall thickness mm |
Minimum wall |
Welded pipe ( 6 m fixed length) |
Galvanized pipe ( 6 m fixed length) |
||
|
Nominal inner diameter |
inch |
|
Thick mm |
Meter weight kg |
Root weight kg |
Meter weight kg |
Root weight kg |
|
|
DN15 |
1/2 |
21.3 |
2.8 |
2.45 |
1.28 |
7.68 |
1.357 |
8.14 |
|
DN20 |
3/4 |
26.9 |
2.8 |
2.45 |
1.66 |
9.96 |
1.76 |
10.56 |
|
DN25 |
1 |
33.7 |
3.2 |
2.8 |
2.41 |
14.46 |
2.554 |
15.32 |
|
DN32 |
1.25 |
42.4 |
3.5 |
3.06 |
3.36 |
20.16 |
3.56 |
21.36 |
|
DN40 |
1.5 |
48.3 |
3.5 |
3.06 |
3.87 |
23.22 |
4.1 |
24.6 |
|
DN50 |
2 |
60.3 |
3.8 |
3.325 |
5.29 |
31.74 |
5.607 |
33.64 |
|
DN65 |
2.5 |
76.1 |
4 |
3.5 |
7.11 |
42.66 |
7.536 |
45.21 |
|
DN80 |
3 |
88.9 |
4 |
|
8.38 |
50.28 |
8.88 |
53.28 |
|
DN100 |
4 |
114.3 |
4 |
|
10.88 |
65.28 |
11.53 |
69.18 |
|
DN125 |
5 |
140 |
4.5 |
|
15.04 |
90.24 |
15.942 |
98.65 |
|
DN150 |
6 |
168.3 |
4.5 |
|
18.18 |
109.08 |
19.27 |
115.62 |
|
DN200 |
8 |
219.1 |
6 (welded pipe) |
|
31.53 |
189.18 |
|
|
|
DN200 |
8 |
219.1 |
6.5 hot-dip galvanizing |
|
|
|
36.12 |
216.72 |
GB / T 3091-2001 hot-dip galvanized pipe wall thickness deviation
|
name Weigh |
Chinese standard |
Enterprise standard |
Contrast conclusion |
||||||
|
Low pressure fluid conveying welded steel pipe |
Welded steel pipe |
||||||||
|
GB/T3091-2001 |
Q/YF01-2002 |
||||||||
|
1 |
Steel pipe outer diameter |
Steel pipe outer diameter, outer diameter allowable deviation |
Better than Chinese standards |
||||||
|
Outer diameter D/mm |
Tube outer diameter deviation mm |
Tube outer diameter Deviation mm |
Outer diameter D |
8″ |
± 0.60mm |
||||
|
D< 48.3 |
± 0.5mm |
|
5″-6″ |
± 0.50mm |
|||||
|
48.3 168.3 |
± 1.0% |
|
4″ |
± 0.40mm |
|||||
|
168.3 508 |
± 0.75% |
+2.4 -0.8 |
3″-“ |
± 0.30mm |
|||||
|
D>508 |
± 1.0% |
+3.0 -0.8 |
2″ or less |
± 0.20mm |
|||||
|
Wall thickness deviation |
± 12.5% |
Wall thickness S |
1.8 5.75mm |
5% |
|||||
|
2 |
Usual length |
Allowable deviation |
length |
Usual length |
Allowable deviation |
Better than Chinese standards |
|||
|
4M-12M |
+20 -0 |
2 inches or less |
5-0 |
||||||
|
Double length: 5-10mn ® should be left for each double in the usual length Margin |
+20 -0 |
2.5 inches – 4 inches |
5-0 |
||||||
|
5 inches or more |
15-0 |
||||||||
|
Special length |
20-0 |
||||||||
Standard: ASTM A53, BS1387-85, GB/T3091-08, DIN2440, JIS-G3444, EN10240, EN10255
Grade: Q195, Q215, Q235, Q345, S235JR, S275JR, STK400, STK500
API SPEC 5L — Specification for Line Pipe
ASTM A53/A53M — Standard Specification for Pipe, Steel, Black and Hot-Dipped, Zinc-Coated, Welded and Seamless
ASTM A500 — Standard Specification for Cold-Formed Welded and Seamless Carbon Steel Structural Tubing in Rounds and Shapes
BS 1387 — Specification for screwed and socketed steel tubes and tubulars and for plain end steel tubes suitable for welding or for screwing to BS 21 pipe threads
BS 1139 — Metal scaffolding. Specification for prefabricated mobile access and working towers
EN 39 — Loose steel tubes for tube and coupler scaffolds
EN 10255 — Non-alloy steel tubes suitable for welding and threading
Hot-dip/cold galvanized steel pipe specification
|
regulation |
grid |
OD mm |
Wall thickness mm |
Minimum wall |
Welded pipe ( 6 m fixed length) |
Galvanized pipe ( 6 m fixed length) |
||
|
Nominal inner diameter |
inch |
|
Thick mm |
Meter weight kg |
Root weight kg |
Meter weight kg |
Root weight kg |
|
|
DN15 |
1/2 |
21.3 |
2.8 |
2.45 |
1.28 |
7.68 |
1.357 |
8.14 |
|
DN20 |
3/4 |
26.9 |
2.8 |
2.45 |
1.66 |
9.96 |
1.76 |
10.56 |
|
DN25 |
1 |
33.7 |
3.2 |
2.8 |
2.41 |
14.46 |
2.554 |
15.32 |
|
DN32 |
1.25 |
42.4 |
3.5 |
3.06 |
3.36 |
20.16 |
3.56 |
21.36 |
|
DN40 |
1.5 |
48.3 |
3.5 |
3.06 |
3.87 |
23.22 |
4.1 |
24.6 |
|
DN50 |
2 |
60.3 |
3.8 |
3.325 |
5.29 |
31.74 |
5.607 |
33.64 |
|
DN65 |
2.5 |
76.1 |
4 |
3.5 |
7.11 |
42.66 |
7.536 |
45.21 |
|
DN80 |
3 |
88.9 |
4 |
|
8.38 |
50.28 |
8.88 |
53.28 |
|
DN100 |
4 |
114.3 |
4 |
|
10.88 |
65.28 |
11.53 |
69.18 |
|
DN125 |
5 |
140 |
4.5 |
|
15.04 |
90.24 |
15.942 |
98.65 |
|
DN150 |
6 |
168.3 |
4.5 |
|
18.18 |
109.08 |
19.27 |
115.62 |
|
DN200 |
8 |
219.1 |
6 (welded pipe) |
|
31.53 |
189.18 |
|
|
|
DN200 |
8 |
219.1 |
6.5 hot-dip galvanizing |
|
|
|
36.12 |
216.72 |
GB / T 3091-2001 hot-dip galvanized pipe wall thickness deviation
|
name Weigh |
Chinese standard |
Enterprise standard |
Contrast conclusion |
||||||
|
Low pressure fluid conveying welded steel pipe |
Welded steel pipe |
||||||||
|
GB/T3091-2001 |
Q/YF01-2002 |
||||||||
|
1 |
Steel pipe outer diameter |
Steel pipe outer diameter, outer diameter allowable deviation |
Better than Chinese standards |
||||||
|
Outer diameter D/mm |
Tube outer diameter deviation mm |
Tube outer diameter Deviation mm |
Outer diameter D |
8″ |
± 0.60mm |
||||
|
D< 48.3 |
± 0.5mm |
|
5″-6″ |
± 0.50mm |
|||||
|
48.3 168.3 |
± 1.0% |
|
4″ |
± 0.40mm |
|||||
|
168.3 508 |
± 0.75% |
+2.4 -0.8 |
3″-“ |
± 0.30mm |
|||||
|
D>508 |
± 1.0% |
+3.0 -0.8 |
2″ or less |
± 0.20mm |
|||||
|
Wall thickness deviation |
± 12.5% |
Wall thickness S |
1.8 5.75mm |
5% |
|||||
|
2 |
Usual length |
Allowable deviation |
length |
Usual length |
Allowable deviation |
Better than Chinese standards |
|||
|
4M-12M |
+20 -0 |
2 inches or less |
5-0 |
||||||
|
Double length: 5-10mn ® should be left for each double in the usual length Margin |
+20 -0 |
2.5 inches – 4 inches |
5-0 |
||||||
|
5 inches or more |
15-0 |
||||||||
|
Special length |
20-0 |
||||||||
Standard: ASTM A53, BS1387-85, GB/T3091-08, DIN2440, JIS-G3444, EN10240, EN10255
Grade: Q195, Q215, Q235, Q345, S235JR, S275JR, STK400, STK500
API SPEC 5L — Specification for Line Pipe
ASTM A53/A53M — Standard Specification for Pipe, Steel, Black and Hot-Dipped, Zinc-Coated, Welded and Seamless
ASTM A500 — Standard Specification for Cold-Formed Welded and Seamless Carbon Steel Structural Tubing in Rounds and Shapes
BS 1387 — Specification for screwed and socketed steel tubes and tubulars and for plain end steel tubes suitable for welding or for screwing to BS 21 pipe threads
BS 1139 — Metal scaffolding. Specification for prefabricated mobile access and working towers
EN 39 — Loose steel tubes for tube and coupler scaffolds
EN 10255 — Non-alloy steel tubes suitable for welding and threading
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