Stainless steel CH20 is an austenitic stainless steel with high corrosion resistance and strength property. It’s typically used for elevated temperature applications. The high chromium and nickel content provides comparable corrosion resistance, superior resistance to oxidation, and the retention of a larger fraction of room temperature strength than CF8 (SS304).
CH20 is listed in ASTM A351 and ASTM A743 standard. Casting UNS number is J93400. WWW.CASTINGQUALITY.COM
Casting Quality Industrial provide CH20 (SS309) by sand casting or investment casting (lost wax precision casting) process.
CH20 (SS309) Equivalent Stainless Steel Grade: WWW.CASTINGQUALITY.COM
Wrought Grade: ASTM/UNS 309;
Wrought UNS: S30900;
AISI 309
JIS G5121 Grade SCS 17;
BS 3100 Grade 309C30;
EN 10088 Grade X12CrNi23-13, EN Number 1.4833
EN 10088 Grade X15CrNiSi20-12, EN Number 1.4828
ASTM A351 Standard Specification for Castings, Austenitic, for Pressure-Containing Parts:
ASTM 743A Standard Specification for Castings, Iron-Chromium, Iron-Chromium-Nickel, Corrosion Resistant, for General Application
ASTM A167 Standard Specification for Stainless and Heat-Resisting Chromium-Nickel Steel Plate, Sheet, and Strip
ASTM A240 Standard Specification for Chromium and Chromium-Nickel Stainless Steel Plate, Sheet, and Strip for Pressure Vessels and for General Applications
ASTM A182: Standard Specification for Forged or Rolled Alloy and Stainless Steel Pipe Flanges, Forged Fittings, and Valves and Parts for High-Temperature Service
ASTM A276: Standard Specification for Stainless Steel Bars and Shapes
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CH20 (SS309) Heat treatment process: WWW.CASTINGQUALITY.COM
Heat to 2000°F [1093°C] minimum, hold for sufficient time to heat casting to temperature, quench in water or rapid cool by other means.
CH20 (SS309) CASTING APPLICATION: WWW.CASTINGQUALITY.COM
Furnaces — burners, doors, fans, piping and recuperators
Thermal Processing — annealing covers and boxes, burners grids, doors, fans, lead pans and neutral salt pots, muffles and retorts, recuperators, walking beams
Waste Treatment — incinerators, rotary kilns and calciners
Fluidized Bed Furnaces — grids, piping, wind boxes
Paper Mill Equipment
Petroleum Refining — catalytic recovery systems, recuperators
Power Generation — pulverized coal burners, tube hangers
CH20 (SS309) High Temperature Corrosion: WWW.CASTINGQUALITY.COM
Alloy CH20 (SS309) resists high temperature corrosion in most in-service conditions. Operating temperatures are as follows:
Oxidizing conditions (max. sulfur content – 2 g/m3)
1922°F (1050°C) continuous service
2012°F (1100°C) peak temperature
Oxidizing conditions (max. sulfur greater than 2 g/m3)
1742°F (950°C) maximum temperature
Low oxygen atmosphere (max. sulfur content – 2 g/m3)
1832°F (1000°C) maximum temperature
Nitriding or carburizing atmospheres
1562 –1742°F (850 – 950°C) maximum
PDF VIEWOur Services
- Sand Casting
Casting Quality focus on Metal Parts industry, we provide professional service in Metal Casting field.
Sand Casting is a popular metal form method, are suitable for all materiel, such as grey iron, ductile iron, malleable iron, carbon steel, stainless steel, aluminum and bronze.
- Investment Casting
also named as precision lost wax casting, mainly suitalbe for carbon steel and stainless steel parts. We also provide grey iron and ductile iron and aluminum and bronze parts by investment casting. It can achieve the best appearance with good tolerance
- Shell Casting
Shell casting method is a good option to replace investment casting and sand casting. the quality is better than sand casting parts, suitable for bulk production.
- CNC Machining
CNC Milling, CNC turning with 5 xix CNC center, we provide precision machining for all castings based on customers design drawings.
- CAD Design
Mechanical Design service based on customers requirement, our software is Solidworks and AutoCAD.
- Tools/Mold Design
Mould design and production will be served for metal casting ad plastic injection industry. Based on our more than 10 years experience, we supply professional molds for our customers in Europe and North American.
Stainless Steel CH20 VS SS309
| Stainless Steel Grade | CH20 (SS309) Chemical Composition /Physical Properties | ||||||||
| Standard | Grade | Carbon | Manganese | Silicon | Sulfur | Phosphorus | Chromium | Nickel | Mo |
| ASTM A743 | CH20 | 0.20 | 1.50 | 2.00 | 0.04 | 0.04 | 22.0-26.0 | 12.0-15.0 | |
| ASTM A351 | CH20 | 0.04-0.20 | 1.50 | 2.00 | 0.04 | 0.04 | 22.0-26.0 | 12.0-15.0 | 0.50 |
| ASTM A167 | 309 | 0.20 | 2.00 | 0.75 | 0.045 | 0.03 | 22.0-24.0 | 12.0-15.0 | |
| ASTM A276 | 309 | 0.20 | 2.00 | 1.00 | 0.045 | 0.03 | 22.0-24.0 | 12.0-15.0 | – |
| 309S | 0.08 | 2.00 | 1.00 | 0.045 | 0.03 | 22.0-24.0 | 12.0-15.0 | – | |
| 309Cb | 0.08 | 2.00 | 1.00 | 0.045 | 0.03 | 22.0-24.0 | 12.0-15.0 | – | |
| 309Cb also have Cb 10xC-1.10 | |||||||||
| ASTM A182 | F309H | 0.04-0.10 | 1.00 | 2.00 | 0.045 | 0.03 | 22.0-24.0 | 12.0-15.0 | – |
| ASTM A240 | 309S | 0.08 | 0.75 | 2.00 | 0.045 | 0.030 | 22.0-24.0 | 12.0-15.0 | – |
| 309H | 0.04-0.10 | 0.75 | 2.00 | 0.045 | 0.030 | 22.0-24.0 | 12.0-15.0 | – | |
| 309Cb | 0.08 | 0.75 | 2.00 | 0.045 | 0.030 | 22.0-24.0 | 12.0-16.0 | – | |
| 309HCb | 0.04-0.10 | 0.75 | 2.00 | 0.045 | 0.030 | 22.0-24.0 | 12.0-16.0 | – | |
| 309Cb and 309HCb also contain Cb 10xCmin, 1.10%max | |||||||||
CH20 (SS309) Stainless Steel Mechanical Property WWW.CASTINGQUALITY.COM
| Stainless Steel Grade | Tensile Strength min | Yield Strength, min | Elongation, min | Reduction of Area | Hardness, Max | |||||
| Standard | Grade | UNS | Ksi | MPa | Ksi | MPa | % | min, % | Brinell | Rockwell B |
| ASTM A743 | CH20 | 15Chromium, 12Nickel | 70 | 485 | 30 | 205 | 30 | – | – | – |
| ASTM A351 | CH20 | J93402 | 70 | 485 | 30 | 205 | 30.0 | – | – | – |
| ASTM A167 | 309 | S30900 | 75 | 515 | 30 | 205 | 40.0 | – | 217 | 95 |
| ASTM A240 | 309S | S30908 | 75 | 515 | 30 | 205 | 40 | – | 217 | 95 |
| 309H | S30909 | 75 | 515 | 30 | 205 | 40 | – | 217 | 95 | |
| 309Cb | S30940 | 75 | 515 | 30 | 205 | 40 | – | 217 | 95 | |
| 309HCb | S30941 | 75 | 515 | 30 | 205 | 40 | – | 217 | 95 | |
| ASTM A182 | F309H | S30909 | 75 | 515 | 30 | 205 | 30 | 50 | – | – |
| ASTM A275 | 309/309S/309Cb | Hot finished | 75 | 515 | 30 | 205 | 40 | 50 | ||
| Cold finished | 90 | 620 | 45 | 310 | 30 | 40 | 1/2 Thickness | |||
| 75 | 515 | 30 | 205 | 30 | 40 | >1/2 Thickness | ||||
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