JIS B2312 SS304 Butt Welding Stainless Steel Elbow
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This Standard specifies the steel and nickel-chromium ferro-alloy seamless pipe fit-tings to be fitted by butt-welding, mainly to pressure service pipings 1), high pressure service pipings 2), high temperature service pipings 3), alloy steel pipings 4) stainless steel pipings 5) low temperature service pipings 6) and steel pipes for fired heaters 7) (hereafter referred to as "pipe fittings").
The special quality requirements, a part of or all of which may be designated by the agreement between the purchaser and the manufacturer, are given in Annex JA and the requirements of special shape pipe fittings are specified in Annex JB. The shapes and dimensions of special bevel ends are shown in Annex JC and marking and report for pipe fittings with special necks are shown in Annex JD for reference.
What is the meaning of SS 304?
Type 304 stainless steel is a T 300 Series Stainless Steel austenitic. It has a minimum of 18% chromium and 8% nickel, combined with a maximum of 0.08% carbon. It is defined as a Chromium-Nickel austenitic alloy. ... Grade 304H with its higher carbon content finds application at elevated temperatures.
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.
Grade 304 Chemical Composition
| Grade | 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 |
Grade 304 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 |
Grade 304 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 |
Application
- Food processing equipment, particularly in beer brewing, milk processing & winemaking
- Kitchen benches, sinks, troughs, equipment and appliances
- Architectural paneling, railings & trim
- Chemical containers, including for transport
- Heat Exchangers
- Woven or welded screens for mining, quarrying & water filtration
- Threaded fasteners
- Springs
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Long Radius JIS B2312 SS304 Butt Welding Elbow Images
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