Zhengzhou Huitong Pipeline Equipment Co.,Ltd. |
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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 SS 304.
Grade 304 is a standard "18/8" stainless. It is the most versatile
and most widely used stainless steel available, even though a wide
range of alternatives are available; and has excellent forming and
welding characteristics. The balanced austenitic structure of Grade
304 enables it to be severely deep drawn without intermediate
annealing. This means that this grade steel is dominant in the
manufacture of drawn stainless parts such as sinks, hollow-ware and
saucepans. For these applications, it is common to use special
"304DDQ" (Deep Drawing Quality) variants. Grade 304 can be readily
braked or roll-formed into a variety of components for applications
in the industrial, architectural, and transportation fields. It
also has outstanding welding characteristics. Post-weld annealing
is not required when welding thin sections.
Composition:
| C | Mn | Si | P | S | Cr | Mo | Ni | N | |
304 | min. | - | - | - | - | - | 18 | - | 8 | - |
max. | 0.08 | 2 | 0.75 | 0.045 | 0.03 | 20 | 10.5 | 0.1 | ||
304L | min. | - | - | - | - | - | 18 | - | 8 | - |
max. | 0.03 | 2 | 0.75 | 0.045 | 0.03 | 20 | 12 | 0.1 | ||
304H | min. | 0.04 | - | - | -0.045 | - | 18 | - | 8 | - |
max. | 0.1 | 2 | 0.75 | 0.03 | 20 | 10.5 |
Mechanical Properties:
Grade | Tensile Strength (MPa) min | Yield Strength 0.2% Proof (MPa) min | Elongation (% in 50 mm) min | Hardness | |
Rockwell B (HR B) max | Brinell (HB) max | ||||
304 | 515 | 205 | 40 | 92 | 201 |
304L | 485 | 170 | 40 | 92 | 201 |
304H | 515 | 205 | 40 | 92 | 201 |
Physical Properties:
Grade | Density (kg/m3) | Elastic Modulus (GPa) | Mean Coefficient of Thermal Expansion (μm/m/°C) | Thermal Conductivity (W/m.K) | Specific Heat 0-100 °C (J/kg.K) | Electrical Resistivity (nΩ.m) | |||
0-100 °C | 0-315 °C | 0-538 °C | at 100 °C | at 500 °C | |||||
304/L/H | 8000 | 193 | 17.2 | 17.8 | 18.4 | 16.2 | 21.5 | 500 | 720 |
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
4.Packaging and transportation: