Tianjin Youfa steel pipe group were founded on July 1st, 2000, with the headquarters location at the largest welded pipe production base in China-Daqiuzhuang Village, Tianjin city, which is a large-scale steel pipe manufacturing enterprise producing many kinds of pipe products GALVANIZED STEEL PIPE, ERW STEE LPIPE, SQUARE AND RECTANGULAR STEEL TUBE, GALVANIZED SQUARE PIPE, SPIRAL STEEL TUBES, STAINLESS STEEL PIPE, SCAFFOLDING, AND PIPE FITTINGS. have been rated as top 500 enterprises of China in the same industry,and as top 500 manufacturing of china.
Youfa brand was affirmed as a China renowned brand by SAIC trademark bureau in March 2008.
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Product
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Hot Dip Galvanized Steel Pipe
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Material
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Carbon Steel
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Grade
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Q195 = S195 / A53 Grade A
Q235 = S235 / A53 Grade B / A500 Grade A / STK400 / SS400 / ST42.2
Q345 = S355JR / A500 Grade B Grade C
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Standard
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EN39, BS1139, BS1387, EN10255,ASTM A53, ASTM A500, A36, ASTM A795,ISO65, ANSI C80, DIN2440, JIS G3444,
GB/T3091, GB/T13793
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Surface
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Zinc coating 200-500g/m2 (30-70um)
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Ends
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Plain ends
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with or without caps
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Galvanized Carbon Steel Pipe Size Chart :
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DN
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OD
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ASTM A53 / API 5L / ASTM A795
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BS1387 / EN10255
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SCH10S
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STD SCH40
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SCH80
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Light
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Medium
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Heavy
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MM
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INCH
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MM
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MM
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MM
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MM
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MM
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MM
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15
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21.3
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1/2"
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2.11
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2.77
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3.73
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2
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2.6
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-
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20
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26.7
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3/4“
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2.11
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2.87
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3.91
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2.3
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2.6
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3.2
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25
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33.4
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1"
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2.77
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3.38
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4.55
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2.6
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3.2
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4
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32
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42.2
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1-1/4"
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2.77
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3.56
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4.85
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2.6
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3.2
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4
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40
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48.3
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1-1/2"
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2.77
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3.68
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5.08
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2.9
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3.2
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4
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50
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60.3
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2"
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2.77
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3.91
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5.54
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2.9
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3.6
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4.5
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65
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73 or 76
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2-1/2"
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3.05
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5.16
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7.01
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3.2
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3.6
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4.5
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80
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88.9
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3"
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3.05
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5.49
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7.62
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3.2
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4
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5
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90
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101.6
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3-1/2"
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3.05
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5.74
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8.08
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100
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114.3
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4"
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3.05
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6.02
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8.56
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3.6
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4.5
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5.4
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125
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141.3
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5"
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3.4
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6.55
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9.53
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5
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5.4
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150
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168.3
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6"
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3.4
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7.11
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10.97
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5
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5.4
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200
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219.1
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8"
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3.76
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8.18
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12.7
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250
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273.1
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10"
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4.19
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9.27
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15.09
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Galvanized Steel Pipe Weight Coefficient
Nominal Wall Thickness (mm): 2.0, 2.5, 2.8, 3.2, 3.5, 3.8, 4.0, 4.5.
Coefficient Parameter (c): 1.064, 1.051, 1.045, 1.040, 1.036, 1.034, 1.032, 1.028.
Note: The mechanical properties of steel are important indicators to ensure the final performance (mechanical properties) of steel, which depend on the chemical composition and heat treatment system of the steel. In the steel pipe standards, according to different usage requirements, tensile properties (tensile strength, yield strength or yield point, elongation), hardness, toughness indicators, and high and low temperature performance required by users are specified.
Steel Grade: Q215A; Q215B; Q235A; Q235B.
Test Pressure Value/Mpa: 3Mpa for D10.2-168.3mm; 5Mpa for D177.8-323.9mm
Current National Standard for Galvanized Steel Pipes
Galvanized Pipe National Standards and Size Standards
GB/T3091-2015 Welded Steel Pipes for Low-Pressure Fluid Delivery
GB/T13793-2016 Straight Seam Electric Welded Steel Pipes
GB/T21835-2008 Welded Steel Pipe Dimensions and Unit Length Weight
Usage of Galvanized Steel Pipes
Instructions for Use of Galvanized Steel Pipes
The commonly referred galvanized pipes, the type of iron pipes used for gas and heating, are also galvanized pipes. As water pipes, after using for several years, a large amount of rust scale is produced inside the galvanized pipes. The yellow water flowing out not only pollutes the sanitary ware but also contains bacteria that breed on the rough inner walls. The rust corrosion causes the content of heavy metals in the water to be too high, which severely endangers human health.
