Zhengzhou Huitong Pipeline Equipment Co.,Ltd.
Zhengzhou Huitong Pipeline Equipment Co., Ltd.
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1.About SS304:
The carbon content of 304H (UNS S30409) is restricted to 0.04–0.10%, which provides optimal high temperature strength.
The carbon content of 304L (UNS 30403) is restricted to a maximum of 0.03%, which prevents sensitization during welding. Sensitization is the formation of chromium carbides along grain boundaries when a stainless steel is exposed to temperatures in the range of approx. 900–1,500 °F (480–820 °C). The subsequent formation of chromium carbide results in reduced corrosion resistance along the grain boundary leaving the stainless steel susceptible to unanticipated corrosion in an environment where 304 would be expected to be corrosion resistant. This grain boundary corrosive attack is known as.
The carbon content of 304 (UNS 30400) is restricted to a maximum of 0.08%. Thus 304 is not useful for corrosive applications where welding is required such as tanks and pipes where corrosive solutions are involved, thus, 304L is preferred. And its lack of a minimum carbon content is not ideal for high temperature applications where optimal strength is required, thus, 304H is preferred. Thus 304 is typically restricted to bars that will be machined into components where welding is not required or thin sheets that are formed in articles such as kitchen sinks or cookware that are also not welded.
Carbon content has a strong influence on room temperature strength and thus the specified minimum tensile properties of 304L are 5 kilopounds per square inch (34 MPa) lower than for 304. However, nitrogen also has a strong influence on room temperature strength and a tiny addition of nitrogen produces 304L with the same tensile strength as 304. Thus, practically all 304L is produced as dual certified 304/304L, meaning it meets the minimum carbon content of 304L and also meets the minimum tensile strength of 304.
Composition:
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Mechanical Properties:
| Grade | Tensile Str (MPa) min | Yield Str 0.2% Proof (MPa) min | Elong (% in 50 mm) min | Hardness | |
| Rockwell B (HR B) max | Brinell (HB) max | ||||
| 316 | 515 | 205 | 40 | 95 | 217 |
| 316L | 485 | 170 | 40 | 95 | 217 |
| 316H | 515 | 205 | 40 | 95 | 217 |
Physical Properties:
| Grade | Density(kg/m3) | Elastic Modulus (GPa) | Mean Co-eff of Thermal Expansion (µm/m/°C) | Thermal Conductivity (W/m.K) | Specific Heat 0-100 °C (J/kg.K) | Elec Resistivity (nΩ.m) | |||
| 0-100 °C | 0-315 °C | 0-538 °C | At 100 °C | At 500 °C | |||||
| 316/L/H | 8000 | 193 | 15.9 | 16.2 | 17.5 | 16.3 | 21.5 | 500 | 740 |
Thickness Test:
3. Introduction to stainless steel pipe fittings:
Stainless steel pipe is a kind of pipe fittings, stainless steel material is it made so called stainless steel pipe fittings, it includes: stainless steel elbow, stainless steel tee, cross stainless steel, stainless steel reducer, stainless steel pipe cap, etc., according to join method can be divided into the socket type stainless steel pipe fittings, flanges threaded stainless steel pipe fittings, stainless steel pipes and welded stainless steel pipe fittings four classes.Where the stainless steel elbow is used for turning the pipe fitting;The flange is used for connecting the pipe to the pipe, connected to the end of the pipe, the stainless steel tee pipe is used for the place where the three pipes meet;A stainless steel four-way pipe is used where four pipes meet;Stainless steel reducing pipe is used for connecting two pipes of different diameters.Main stainless steel materials :304, 304L, 316|, 316L
4.Classification of seamless elbow:
Seamless elbow pipe fittings are divided into hot-rolled (extruded) seamless elbow pipe fittings and cold drawn (rolled) seamless elbow pipe fittings due to different manufacturing processes. Cold drawn (rolled) pipe is divided into two kinds: round pipe and special-shaped pipe.
The raw material for rolling seamless elbow pipe fittings is round tube blank. The round tube blank needs to be cut and processed by the cutting machine with a growth of about one meter, and sent to the furnace for heating through the conveyor belt. The billet is heated in a furnace at a temperature of about 1200 degrees Celsius. The fuel is hydrogen or acetylene. The temperature control in the furnace is a key problem. After the round tube is discharged, it needs to be pierced by a pressure piercer. The common piercer is the cone roll piercer. This kind of piercer has high production efficiency, good product quality, large perforation expanding capacity and can wear many kinds of pipe fittings. After piercing, the round tube blank is successively rolled, continuously rolled or extruded by three rollers. After extrusion, the tube shall be removed for sizing. The sizing machine uses a cone-shaped drill to drill holes into the steel embryo at high speed, forming pipe fittings.