[Weekly Topic] What is the difference between pipeline materials 20, 20g, and 20G?
Thread Content
This post was last edited by WQC on 2010-12-11 10:58. What are the differences between pipe materials 20, 20g, and 20G? ? (Please hide your replies) The “20” in 20 steel refers to the carbon content; with a carbon content of 0.2%, it belongs to low-carbon steel. Chemical composition of standard JB/T 6057-92 steel (mass percentage, %): C 0.17~0.23, Si 0.17~0.37, Mn 0.35~0.65, P≤0.035, S≤0.035, Ni≤0.30, Cr≤0.15, Cu≤0.25. The allowable stress of steel grade 20 at 225°C ranges from (16–36 mm): 111–124 MPa; for thicknesses in the range of (6–16 mm), it is 117–131 MPa. The allowable stress of steel grade 20 at 100°C is 130 MPa for pipes made from this steel, while for forged products of this grade, the allowable stress is 108 MPa. U) D7 20g is a grade of boiler steel plate (per GB 713), whereas 20G is a grade of high-pressure carbon steel boiler tubes (per GB 5310); they are fundamentally two different materials with distinct manufacturing processes, compositions, and properties. What is the difference between 20G and 20g? 20g – pronounced as “20 Guo” – refers to sheet material, and its allowable stress is not specified in GB150-1998; it can be used as a substitute for Q235-C ； 20G – read as 20 High; it is a type of pipe that complies with the specifications in GB6479-2000 \"Seamless Steel Tubes for High-Pressure Fertilizer Equipment\", and its allowable stress is specified in GB150-1998. / Z. ’ h: n6 Q# Y1 H6 v @ \; H – One of these is a sheet material, while the other is a tubular material; logically, they cannot be compared. However, to illustrate the point, let’s take a look at their main characteristics: - `8 g e; D+ ?5 D; y; N 1. Phosphorus and sulfur content: $ C8 q0 g) J2 u7 i 20g: P content ≤ 0.035%, S content ≤ 0.035%. 20G: P content ≤ 0.030%, S content ≤ 0.030%. Of course, there are also differences in the content of other chemical elements. Tensile test for 20g: σb (MPa) 400–520, σs (MPa) ≥225, δ5 (%) ≥24. For 20G: σb (MPa) 410–550, σs (MPa) ≥245, δ5 (%) ≥24. Impact test for 20g: at 20°C, Akv in the transverse direction ≥27 J. For 20G: at -20°C, Akv in the longitudinal direction ≥18 J or Auv ≥39 J
This post was last edited by WQC on 2010-12-11 at 11:00. Type 20 is a seamless steel tube used for transporting fluids, in accordance with the standard GB8163, and is suitable for medium and low pressure applications； 20g is steel plate for boilers, with the standard GB713; it is in sheet form ； 20G is a grade for high-pressure carbon steel boiler tubes; the applicable standard is GB5310, and it is suitable for medium to high-pressure applications ；
This post was last edited by WQC on 2010-12-11 at 11:01. 20G is the steel grade listed for seamless steel tubes used in high-pressure boilers； 20g is the steel grade listed for boiler steel plates. 20 is high-quality carbon structural steel
20G is a high-pressure seamless steel tube; it is a type of pipe, and “G” represents high pressure； 20g is steel for boilers; it is in sheet form, and “g” is the pronunciation of ‘pot’
What is the difference between G and 20g? 20g – read as 20 Guo; it is a type of steel plate. Its allowable stress is not specified in GB150-1998, and it can serve as a substitute for Q235-C； 20G – read as 20 High; it is a type of pipe that complies with the specifications in GB6479-2000 \"Seamless Steel Tubes for High-Pressure Fertilizer Equipment\", and its allowable stress is specified in GB150-1998. One is a sheet material and the other is a tubular material; logically, they cannot be compared. However, to illustrate the point, let’s take a look at their main characteristics: 1. Phosphorus and sulfur content – For 20g grade: P content ≤ 0.035%, S content ≤ 0.035%; for 20G grade: P content ≤ 0.030%, S content ≤ 0.030%. Of course, there are also differences in the content of other chemical elements. 2. Tensile test: 20g: σb (MPa) 400–520, σs (MPa) ≥225, δ5 (%) ≥24; 20G: σb (MPa) 410–550, σs (MPa) ≥245, δ5 (%) ≥24. 3. Impact test: 20g: temperature 20°C, transverse Akv ≥27 J; 20G: temperature -20°C, longitudinal Akv ≥18 J or Auv ≥39 J
20 is in accordance with GBT8163 – seamless steel tubes for transporting fluids. 20G complies with GB5310 – seamless steel tubes for high-pressure boilers; currently, it is replaced by Q235-B, or 20
I don’t know; I’m here to learn*, no need to give me extra points
The “20” in 20 steel refers to the carbon content; with a carbon content of 0.2%, it belongs to low-carbon steel. Chemical composition of standard JB/T 6057-92 steel (mass percentage, %): C 0.17~0.23, Si 0.17~0.37, Mn 0.35~0.65, P≤0.035, S≤0.035, Ni≤0.30, Cr≤0.15, Cu≤0.25. The allowable stress of steel grade 20 at 225°C ranges from 111–124 MPa for thicknesses between (16–36 mm), and from 117–131 MPa for thicknesses between (6–16 mm). At 100°C, the allowable stress for steel grade 20 is 130 MPa for pipes, while it is 108 MPa for forgings. 20g is a grade for boiler plates (per GB 713), whereas 20G is a grade for high-pressure carbon steel boiler pipes (per GB 5310); they are essentially two different materials with distinct manufacturing processes, compositions, and properties. What is the difference between 20G and 20g? 20g – pronounced as 20 Guo – refers to plates, and its allowable stress is not specified in GB150-1998; it can be used as a substitute for Q235-C ； 20G – read as 20 High; it is a type of pipe that complies with the specifications in GB6479-2000 \"Seamless Steel Tubes for High-Pressure Fertilizer Equipment\", and its allowable stress is specified in GB150-1998. One is a sheet material and the other is a tubular material; logically, they cannot be compared. However, to illustrate the point, let’s take a look at their main characteristics: 1. Phosphorus and sulfur content – For 20g grade: P content ≤ 0.035%, S content ≤ 0.035%; for 20G grade: P content ≤ 0.030%, S content ≤ 0.030%. Of course, there are also differences in the content of other chemical elements. 2. Tensile test: 20g: σb (MPa) 400–520, σs (MPa) ≥225, δ5 (%) ≥24; 20G: σb (MPa) 410–550, σs (MPa) ≥245, δ5 (%) ≥24. 3. Impact test: 20g: temperature 20°C, transverse Akv ≥27 J; 20G: temperature -20°C, longitudinal Akv ≥18 J or Auv ≥39 J
20 refers to ordinary 20# steel. 20g’s G is steel used for boilers; as for 20G, I’m not sure – I need to study it a bit
To be determined; thank you for not answering!
Reply 1# sxtblo: It’s probably due to different pressures and different application scenarios