Which companies are currently manufacturing large-diameter pipes?

I’ve been busy with the preliminary stages during this time and haven’t had the chance to talk with Hai Chuan and my old friends. Now that the project is finally underway, I’m back again. I’d like to let all the leaders and friends know that I’m back – it feels great to be home. The preliminary construction for the project will start soon. I will have many questions to ask you in the future, so please feel free to offer your guidance. :)

Pipe fittings can’t be of any help; only those related to flanges can assist

I need to know the standards, materials, diameter, and wall thickness of the seamless steel pipe in order to answer your question.

It is used for the underground pipelines in coal chemical industries; various diameters as well as different materials and wall thicknesses are required, which is why I asked the manufacturer about the details. Look, I wonder if any kind-hearted person can help out.

Tianjin Da WuSeong produces large-diameter pipes; it’s a large state-owned enterprise. There’s no way to get in there – it’s an amazing company, haha. I’m not an affiliate

The maximum diameter of Tianjin Da WuSeong seems to be 325, right? Isn’t the Piller mill yet built? It is recommended not to use the large-diameter pushed pipes from Tianjin Dawusong Industrial Company! ! ! ! ! The main material for underground pipelines is steel pipes; are they process pipelines or water supply and drainage pipelines? It would be a waste to use seamless pipes for water supply and drainage purposes.:lol For process pipelines: Baosteel offers grades ranging from 114 to 325; within this range, the grades 114–168 are produced using steel grades 20# to P91 (manufactured by Baosteel’s main plant), while the grades in the other ranges, 20# to P22, are produced by Baosteel Lubao Steel Pipe Company. Chenggang Company of Pangang Group: 168~630; a wide range of steel grades are available, but grades such as P9 and P91 cannot be produced. There are also Baogang, Hengyang Valin, and others. Actually, you can just look it up online.

Thank you all for your answers. If you look it up online, you can only find out information about the companies themselves; it’s not possible to determine which one is better. What I need are mainly process pipelines, with a small amount of water supply and drainage pipelines as well.

The manufacturer of pipes with the largest diameter is Chengdu Seamless Steel Pipe Factory, which produces pipes in a 630 specification. Tianjin Da WuSeong Seamless Steel Pipe Factory can produce pipes up to a diameter of 426; however, the quality of the large-diameter pushed pipes produced by Tianjin Da WuSeong Industrial Company is also very good, with a maximum diameter of around 820. This company mainly produces ordinary carbon seamless steel pipes, alloy seamless steel pipes, pipes specifically designed for gas cylinders, and oil casing pipes