Supply divided into three categories based on usage: supply by mechanical properties, supply by chemical composition and mechanical properties, and supply by hydrostatic testing. If used to withstand liquid pressure, hydrostatic testing is also required. Divided into two types by usage: general-purpose (used for water and gas pipelines, structural components, and mechanical parts) and specialized (used for boilers, geological exploration, bearings, acid resistance, etc.). Seamless steel pipes have a wide range of applications. General-purpose seamless steel pipes are rolled from ordinary carbon structural steel, low-alloy structural steel, or alloy structural steel, with high production volume, mainly used as pipelines for conveying fluids or structural parts. Supply is divided into three categories based on usage: supply by chemical composition and mechanical properties, supply by mechanical properties, and supply by hydrostatic testing. If used to withstand liquid pressure, hydrostatic testing is also required. Seamless steel pipes have a hollow section and are widely used as pipelines for conveying fluids, such as oil, natural gas, coal gas, water, and certain solid materials. Seamless pipes include boiler seamless pipes, chemical and power industry seamless pipes, geological exploration seamless steel pipes, and oilfield seamless pipes, among others. Compared to solid steel like round bars, Handan profile steel market prices have narrowed and fallen slightly. According to the market monitoring by the Lang Iron and Steel Information Research Center, the current price of 25# I-beams produced in Tangshan is 4010 yuan, down 10 yuan; the price of 16# channels in Tangshan is 3940 yuan, down 20 yuan; the price of 10# channels in Wuji is 3840 yuan, down 30 yuan; the price of 5# angles in Tangshan is 4050 yuan, down 20 yuan (all prices are gross weight and tax-inclusive). Affected by the decline in costs, Handan profile steel market prices have fallen, and after the decline, local resources have seen some improvement in transactions, with a rebound of 10 yuan in the market. In the afternoon, Wuping City issued intensified emergency control measures for steel and coking plants, requiring all sintering machines to be shut down, blast furnaces to retain one normal production unit, and the rest to be procured for emergency shutdown control by焖炉 or扒炉; coking enterprises, the coke production time is extended to more than 36 hours. The limit production news is once again hyped, and the futures market cooperates with a bottom rebound, with slightly improved low-volume trading in the afternoon, but the rebar closed down 40 points to below 3700, billets fell 20 yuan to 3400 yuan, market sentiment remains pessimistic, and it is expected that the price of profiles will continue to be weak tomorrow. On the 30th, the domestic seamless pipe market price stabilized with a slight increase, with small and medium-sized pipe resources scarce and some specifications in short supply. The monitoring data from the Lang Iron and Steel Cloud Business Platform shows that today, the average price of 108*4.5mm seamless pipes in key cities across the country is 4859 yuan, up 3 yuan from the previous trading day. Among them, Beijing, Taiyuan, and Cangzhou have increased by 30-50 yuan, with the current market price at 4600-4650 yuan. In terms of seamless pipes, the overall price remains strong, mainly affected by environmental protection production restrictions, with lower inventory of non-mainstream resources in the downstream market in the early stage, such as some markets experiencing out-of-stock phenomena for the 133 series in recent days. This morning, the main black series rebars gradually strengthened, but the support at high levels was insufficient, and they fell again in the afternoon. The major traders in leading cities showed good delivery performance, but some market demand remained weak, with prices remaining firm. Actual dimensions of commonly used 20# seamless steel pipes are 76, 89, 159, and 219mm in diameter, and they are all in short supply, with slower delivery speeds.