Zhengzhou Huitong Pipeline Equipment Co.,Ltd.
Zhengzhou Huitong Pipeline Equipment Co., Ltd.
Add to Cart
1. Compared with 304 stainless steel, the advantages of duplex stainless steel are as follows:
(1) the yield strength of austenitic stainless steel is twice higher than that of ordinary austenitic stainless steel, and it has enough plastic toughness for forming. The wall thickness of the tank or pressure vessel made of duplex stainless steel is 30-50% less than that of austenite, which is helpful to reduce the cost.
(2) it has excellent resistance to stress corrosion cracking. Even the duplex stainless steel with the lowest alloy content has higher resistance to stress corrosion cracking than the austenitic stainless steel, especially in the environment containing chloride ions. Stress corrosion is an outstanding problem that is difficult to solve for ordinary austenitic stainless steel.
(3) the corrosion resistance of 2205 duplex stainless steel, which is widely used in many media, is better than 316L austenitic stainless steel, while the super duplex stainless steel has very high corrosion resistance. In some media, such as acetic acid, formic acid, etc., it can even replace high alloy austenitic stainless steel and even corrosion-resistant alloy.
(4) it has good local corrosion resistance. Compared with austenitic stainless steel with the same alloy content, its wear resistance and fatigue corrosion resistance are better than austenitic stainless steel.
(5) compared with austenitic stainless steel, the coefficient of linear expansion is lower, close to carbon steel, suitable for connection with carbon steel, which has important engineering significance, such as production of composite plate or lining, etc.
(6) no matter under the condition of dynamic or static load, it has higher energy absorption capacity than austenitic stainless steel, which has obvious advantages in dealing with sudden accidents such as collision, explosion, etc., and has practical application value.
2.About duplex stainless steel 2205:
Applications
Welded pipe, tubular components,chemical processing, transport and storage, pulp and paper digesters, liquor tanks and paper machines, oil and gas exploration and processing equipment
Description
Duplex Alloy 2205 is a two-phase, ferritic, austenitic 22% chromium, 3% molybdenum, 5 to 6% nickel alloyed stainless steel. It is the most widely used duplex stainless steel grade and is characterized by high yield strength, double that of the standard austenitic stainless steel grades. It demonstrates good fatigue strength, as well as outstanding resistance to stress-corrosion cracking, crevice, pitting, erosion and general corrosion in severe environments.
Chemistry Typical
| Chemical Requirements | |||||||
| Ni | Cr | Mo | Mn | C | Si | Fe | |
| Max | 6.5 | 27 | 3.9 | 1.5 | 0.04 | 1 | Bal |
| Min | 4.5 | 24 | 2.9 | ||||
Physical Properties
| Mechanical Property Requirements | |||||
| Ultimate Tensile | Yield Strength (0.2% OS) | Elong. | R/A | Hardness Brinell | |
| Min | 110 KSi | 80 KSi | 15% | ||
| Max | 297 | ||||
| Min | 760 MPa | 550 MPa | |||
| Max |
| ||||
NDT:
Nondestructive testing is to detect the internal and surface defects of the workpiece without damaging the workpiece.
Nondestructive testing is to use the change of thermal, acoustic, optical, electrical, magnetic and other reactions caused by the abnormal internal structure or defects of materials. By means of physical or chemical methods, with the help of modern technology and equipment, the method of inspection and test for the structure, property, state and defect type, property, quantity, shape, position, size, distribution and change of the internal and surface of the test piece.
General test method: NT MT Pt RT VT et
Bevel degree detection:
4.Packaging and transportation: