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.
In order to obtain seamless pipes with smaller size and better quality, cold rolling, cold drawing or a combination of both must be used. Cold rolling is usually carried out on a two high mill. The steel pipe is rolled in an annular pass composed of variable section circular groove and fixed conical plug. Cold drawing is usually carried out on a single chain or double chain cold drawing machine of 0.5 ~ 100t.
.600 Series & mdash; martensitic precipitation hardening stainless steel pipe.
Cold rolled non oriented silicon steel strip consists of nominal thickness (expanded by 100 times) + code a + iron loss guarantee value (the value after expanding the iron loss value when the frequency is 50Hz and the large magnetic flux density is 5T by 100 times). For example, 50a470 indicates that the thickness is 0.5mm and the guaranteed value of iron loss is & le; 7 cold rolled non oriented silicon steel strip.
.The corrosion resistance of duplex stainless steel, which is widely used in many media, is better than that of ordinary l austenitic stainless steel, while super duplex stainless steel has very high corrosion resistance. In some media, such as acetic acid and formic acid, it can even replace high alloy austenitic stainless steel and even corrosion resistant alloy.
201 series & mdash; Chromium nickel manganese austenitic stainless steel.
(VI) the growth rate of fixed asset investment in the iron and steel industry dropped significantly. From 2013 to June, the investment in fixed assets in the iron and steel industry was 303.5 billion yuan, a year-on-year increase of 3%, of which the investment in ferrous metal smelting and rolling was 235.6 billion yuan, a year-on-year increase of 3%, down 1 percentage point from the same period in 2012; The investment in ferrous metal mining and dressing was 67.9 billion yuan, a year-on-year increase of 8%, and the growth rate fell sharply by 15 percentage points.
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, stainless steel pipes will not rust. However, 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, let's understand the structure of stainless steel pipe: stainless steel pipe is a crystal solid composed of atoms similar to a piece of toys. In addition to iron, 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, 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.
No solution treatment. The alloy elements do not dissolve into the matrix, resulting in low alloy content and poor corrosion resistance.
Under plasma arc cutting corrosion conditions, there are dust containing other metal elements or attachments of dissimilar metal particles on the surface of stainless steel. In the air, the condensate between the attachments and stainless steel connects them into a micro battery, which causes electrochemical reaction and the protective film is affected, which is called electrochemical corrosion.
Variable cost. SPHDSPHD—& mdash; Hot rolled steel plate and strip for stamping.
High pressure water jet cutting (professional water cutting: Shanghai Xinwei)
500 Series & mdash; Heat resistant chromium alloy steel.
The large electric clamping tool is 220V power supply, and the motor drives the oil cylinder to clamp. The connecting oil pipe and quick connector must not be contaminated, turn on the power supply first, then tighten the pressure relief valve, wait until the pressure gauge rises to about 45MPa, or the main engine automatically trips then open the pressure relief valve, and remove the tong head after complete pressure relief.
Encyclopedic knowledge.Stainless steel with domestic (imported) stainless steel belt: stainless steel coil belt turn off the power supply, stainless steel spring belt, stainless steel stamping belt, stainless steel precision belt, stainless steel mirror belt, stainless steel cold rolling belt, stainless steel
Model 309 & mdash; It has better temperature resistance.
201 series & mdash; Chromium nickel manganese austenitic stainless steel.
.. 18%), which is better than l and 317L in most environments.
408— Good heat resistance, 11% Cr, 8% Ni.
Stainless steel is more than twice as high and has enough plastic toughness for forming. The wall thickness of storage tank or pressure vessel made of duplex stainless steel is 30-50% less than that of common austenite, which is conducive to reducing the cost.