Among the steel products exported by China, steel pipe has always been the focus of foreign anti-dumping and countervailing investigations. The Russian Ministry of industry and trade announced an anti-dumping investigation on China's cold-rolled stainless steel seamless steel pipes exported to the Russian Belarus Kazakhstan customs union. Before that, the Brazilian foreign trade chamber also said that it would impose an anti-dumping tariff of US $743 per ton (about RMB 4748 yuan) on China's steel pipe products, which is valid for five years.
The application range is wider than that of ferritic stainless steel. Compared with ferritic stainless steel, duplex stainless steel has the following disadvantages: high alloy element content and relatively high price. Generally, ferritic stainless steel does not contain nickel.
.Stainless steel pipe packing bag is nothing more than the function of protecting the surface of stainless steel pipe, so most stainless steel pipe users do not have to question this point.
·Oil and gas pipeline, heat exchanger and pipe fittings.
.The length of tungsten electrode protruding from the gas nozzle is preferably 4 ~ 5mm. In places with poor shielding such as fillet welding, it is 2 ~ 3mm, and in places with deep groove, it is 5 ~ 6mm. The distance from the nozzle to the working is generally no more than 5mm.
Cold formed alloys can be cut and cold formed. However, due to its high strength and hardness, the alloy needs cold forming more than austenitic steel. Because of its high strength, springback should be fully considered.
Stainless steel pipe will not rust, but it is relatively not easy to rust. It will rust in a specific environment. It will rust if placed in seawater or acid-base environment. Even in the air, it will be corroded and oxidized slowly, but it will take a long time. In general, if the stainless steel pipe is used or maintained improperly or the environment in which the stainless steel pipe is located is too bad, we can quickly confirm that it is a sign of rust. Why does stainless steel pipe rust? First of all the stainless steel pipe may rust. When we see rust spots on the steel surface, it also contains its metal components, such as chromium, nickel, titanium, etc. Chromium and nickel have anti rust function. It forms a protective film - passive film to prevent stainless steel pipe from rusting. Generally, as long as the film is not damaged, broken or contaminated by impurities, the stainless steel pipe will not rust. However, if the blunt film is damaged due to improper use or maintenance, the stainless steel pipe will rust.
(I) The output reached a record high. From January to June, 2013, the country produced 900 million tons of crude steel, an increase of 4% year-on-year, an increase of 6 percentage points over the same period last year. In the first six months, the average daily output of crude steel was 240000 tons, equivalent to the level of 8.6 billion tons of crude steel. Among them, it reached a record high of 2.208 million tons in February. Although it fell from March to June, it still remained at a high level of more than 2.1 million tons. From January to June, according to provinces and regions, The crude steel output of Hebei and Jiangsu increased by 8% and 2% respectively year-on-year. The total new output of the two provinces accounted for 44% of the national increase of 26.94 million tons. In addition, the output of Shanxi, Liaoning, Henan and Yunnan also increased by more than 1 million tons. According to the types of enterprises, 2 percentage points lower than the national average increase. The professional L stainless steel pipe and s stainless steel pipe Steel pipe and 904L stainless steel pipe have high pressure rating good waterproof performance, fire and high temperature resistance, strong overload capacity, corrosion resistance, radiation protection and long service life. However, 60% of the increase in production still comes from key large and medium-sized iron and steel enterprises.
600 Series & mdash; martensitic precipitation hardening stainless steel pipe.
Seamless stainless steel pipe, also known as stainless steel pipe, is made of steel ingot or solid pipe blank through perforation, and then made by hot rolling, cold rolling or cold drawing. The specification of seamless steel pipe is expressed by outer diameter * wall thickness mm. With the implementation of China's reform and opening up, the national economy has achieved rapid growth, and a large number of urban houses, public buildings and tourism facilities have been built, which puts forward new requirements for hot water supply and domestic water supply. In particular, people pay more and more attention to the problem of water quality, and the requirements are also increasing. Galvanized steel pipe, a common pipe, will gradually withdraw from the historical stage under the influence of relevant countries because of its corrosivity. Plastic pipe, composite pipe and copper pipe have become common pipes in the pipeline system. However, under certain circumstances, hot water system and water supply system that puts safety and sanitation first especially the stainless steel pipe with wall thickness of only 0.6 ~ 2mm. In high-quality drinking water system, it has the characteristics of safety, reliability, sanitation, environmental protection, economy and applicability. It has been proved by engineering practice at home and abroad that it is one of the new, energy-saving and environmental protection pipes with good comprehensive performance of water supply system. It is also a very competitive water supply pipe, which will play an incomparable role in improving water quality and people's living standards.
manufacturer.The welding performance is also much better than that of ferritic stainless steel. Generally, preheating is not required before welding and heat treatment is not required after welding.
It has lower linear coefficient than austenitic stainless steel and is close to carbon steel. It is suitable for connection with carbon steel and has important engineering significance, such as the production of composite plate or lining.
High temperature oxidation resistance stainless steel plates have high temperature oxidation resistance, but the oxidation rate will be affected by inherent factors such as environment and product form.
Polishing at present stainless steel products are generally polished in the production process, this requires good polishing performance of raw materials. The main factors affecting the polishing performance are as follows: 1. Surface defects of raw materials. Such as scratch, pitting, soaking, etc.
Welcome calls .2 physical properties chemical composition C: it is specified in, which is usually also called mo2ti or mechanical properties ys (MPA)
The continuous casting of stainless steel pipe fittings is generally matched with the refining furnace, which has strict requirements on the chemical composition and temperature of molten steel; In order to prevent secondary oxidation of molten steel, non oxidation protection pouring is required during continuous casting production; Strict requirements for refractory materials such as ladle, tundish, nozzle and submerged nozzle.
There are ba face, 2b face, (white skin) 2D face, (frosted), HL (wire drawing), 8K face and other surfaces with good quality and brightness.
. 630— Common precipitation hardening stainless steel models, products and tens of millions of products are up to you to choose. Professional stainless steel plate, stainless steel coil, stainless steel belt and stainless steel pipe are safe and secure. They are usually also called 17-17% Cr and 4% Ni.
Stainless steel water supply pipe is a healthy, sanitary and energy-saving water pipe, whether it is for household or large engineering buildings
·Rotary shaft, press roller, blade, impeller, etc. in high-strength corrosion-resistant environment.