January 2, 2019

Stainless Steel CH20 (SS309)

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 and 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

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


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.


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

Our Services

  1. 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.

  2. 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

  3. 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.

  4. CNC Machining

    CNC Milling, CNC turning with 5 xix CNC center, we provide precision machining for all castings based on customers design drawings.

  5. CAD Design

    Mechanical Design service based on customers requirement, our software is Solidworks and AutoCAD.

  6. 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.

The Difference between CH20 and SS309

Stainless Steel CH20 VS SS309


Stainless Steel GradeCH20 (SS309) Chemical Composition /Physical Properties
ASTM A1673090.202.000.750.0450.0322.0-24.012.0-15.0
ASTM A2763090.
309Cb also have Cb 10xC-1.10
ASTM A182F309H0.04-
ASTM A240309S0.080.752.000.0450.03022.0-24.012.0-15.0
309Cb and 309HCb also contain Cb 10xCmin, 1.10%max

CH20 (SS309) Stainless Steel Mechanical Property WWW.CASTINGQUALITY.COM

Stainless Steel GradeTensile Strength minYield Strength, minElongation, minReduction of AreaHardness, Max
StandardGradeUNSKsiMPaKsiMPa%min, %BrinellRockwell B
CH2015Chromium, 12Nickel704853020530
ASTM A167309S30900755153020540.021795
ASTM A240309SS3090875515302054021795
ASTM A182F309HS3090975515302053050
ASTM A275309/309S/309CbHot finished75515302054050
Cold finished906204531030401/2 Thickness
75515302053040>1/2 Thickness

Metal Castings

Bronze Lid Castings

Bronze Lid Castings made by investment casting or sand casting, CNC machinign is avaliable too.

Bronze Clamp Castings

Bronze Clample casting is made by investment casting or sand casting for pluming industry.

Stainless Steel Pump Impeller

Stainless Steel impellers for pump industry, made by investment casting process with CNC machining and balancing. The casting material can be CF8M/CF3M/CF8/CF3/CA15/SS2205

Stainless Steel Casting Cover

Stainless Steel Cover Casting, investment casting process, stainless steel casting with CNC machining.

Duplex Stainless Steel Casting Impeller

Duplex stainelss steel castng, ASTM A890/995 5A, ss2507 stainless steel castings pump impeller by investment casting process.

Stainless Steel Ring Gear Casting

Star ring gear require precision gear teeth, investment casting is a good process to get a precision tolerance gear castings, its metal can be stainles steel casting or carbon steel casting or alloy steel casting.

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About China Castings
sand casting, investment casting, CNC machining and other castings from Chinese foundry

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