ASMT A333 Grade 1 seamless and welded pipes shall be treated to control their microstructure.

ASTM A333 Grade 3 is the part of standard covers wall seamless and welded carbon and alloy steel pipe intended for use at low temperatures. ASTM A333 Grade 3 alloy pipe shall be made by the seamless or welding process with the addition of no filler metal in the welding operation.

ASTM A333 Grade 7 Standard covers seamless and welded steel pipe for low temperature service.

Silicon carbide is formed in two ways, reaction bonding and sintering. Each forming method greatly affects the end microstructure.

ASTM A519- specification covers for several grades of carbon and alloy steel mechanical tubing, either hot-finished or cold-finished. The steel used in the mechanical tubing may be cast in ingots or may be strand cast. When steel of different grades is sequentially strand cast, identification of the resultant transition material is required.

ASTM A213 T5 is the part of ASTM A213 Standard Specification for Seamless Ferritic and Austenitic Alloy-Steel Boiler, Superheater, Heat-Exchanger Tubes.

Some steel companies lowered the purchase price of scrap steel, ranging from 20-30 yuan (ton price, the same below). As a result, the scrap market from North China to East China has declined. At this stage, most traders did not participate.

For the next week's market, remind everyone to pay attention to the following aspects: First, the demand factor. According to the data of the Xiben Shinkansen trading platform, although the high temperature weather has obviously eased this week, the demand for terminal demand in Shanghai continues to decline, factors such as the reduction of iron ore and billet prices and the fall of steel futures have aggravated the market's wait-and-see mood. In the process of rising prices in the early period, the site has generally increased the inventory replenishment. The market demand has been overdrawn to a certain extent. At the same time, the price decline has also reduced the enthusiasm of the site replenishment. The terminal demand for steel pipes will still be difficult to improve next week.

The arrival of each finished product resource is relatively limited, and the main resources of the steel pipe circulation link still appear to be broken, and the rise of the futures market has obvious supporting effect on the stability of the spot market sentiment, coupled with the stable growth policy, the bottom steel market, the transaction status of the main finished products Some things have changed, and the overall price has remained strong and shocked in the short term.

The price of the large-diameter high-pressure seamless pipe for pressure vessels GB/T 9948-2013 is not affected by the city, and it stands proudly.

Steel pipe of these factors must not be ignored when the preform is heated in the low temperature section, it will affect production quality. The heating period of the low temperature section is often a critical period for heating some special alloy steels, because the steel has low heat conduction performance and low plasticity, and if the heating rate is too fast, heating cracks or even fractures may occur.

Go out of the country and go out of the world! Tianjin seamless steel pipe products were unveiled at the Oman International Oil and Gas Exhibition. The 2019 Oman International Oil and Gas Exhibition was held recently in Muscat, the capital of Oman. Tianjin Pipe Group successfully participated in the exhibition, further consolidating and enhancing the popularity and influence of the TPCO brand in the international market.

1. Where is the root cause of the difficulties in the steel industry and how long can it last?

Tangshan Iron and Steel Group, a subsidiary of Hebei Iron and Steel Group, recently reached an agreement with Veolia, which will be responsible for the construction and operation of water treatment and circulating water projects for two industrial projects under Tangshan. The contract period is 30 years and the cumulative income of the two projects is 390 million euros.

Recently, the futures have fallen, and domestic steel prices have continued to weaken, which has made the market mentality pessimistic. In terms of downstream demand, after half a year of hard work, the degree of improvement is still limited, but the production enthusiasm of steel mills is not diminished. In this situation, the future of the steel market is rampant.

From 79 to 35, 43 to 11, and 44 to 32, the reduction in a set of numbers has attracted a lot of attention in the field of foreign investment.

The Turkish Ministry of Economic Affairs announced that Turkey has started anti-dumping investigations on cold-rolled stainless steel products imported from China and Taiwan. PoscoAssanTST, a Turkish-based steel producer in Pohang, Turkey, applied to the relevant authorities, saying that cold-rolled stainless steel imported from mainland China and Taiwan has already caused damage to the Turkish domestic industry.

On May 4th, the Stainless Steel Branch of China Special Steel Enterprise Association released the statistics of China's stainless steel crude steel production, import and export, and apparent consumption in the first quarter of 2017.

　　The inner diameter of the stainless steel cylinder tube indicates the output force of the cylinder. The piston should slide smoothly in the cylinder, and the inner surface roughness of the cylinder should reach ra0.8um. The inner surface of the steel pipe column should be plated with hard chrome to reduce friction and wear and prevent corrosion. The cylinder material is made of high-strength aluminum alloy and brass, except for high-carbon steel pipes. This small cylinder is made of stainless steel. In corrosive environments, cylinders using magnetic switches or cylinders should be made of stainless steel, aluminum or brass.

　　Since the surface of the stainless steel tube will form a thin protective film, although the protective film is about 3×10-6 mm, it is very tough. Even if it is destroyed, as long as there is oxygen next to it, it can be regenerated immediately to prevent rust. As long as you know the characteristics of stainless steel and use it correctly.

　　There are many types of steel pipes and different uses, so their technical requirements are different and production methods are different.