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Alloy 20 Corrosion Resistant Castings

2026-04-22

Product: Superior acid & chloride corrosion resistance, weldable, high strength Alloy 20 (Carpenter 20) corrosion resistant castings

MOQ: 1 piece

Model NO: Customized

Size: As per drawing

Machining tolerance: +/-0.01mm

Application: Chemical, Petrochemical, Pharmaceutical, Food Processing, Acid Handling Equipment

Material: Alloy 20 (Carpenter 20, CN7M, UNS N08020, 2.4660, NS143)

Surface Treatment: Precision Machining, Passivation, Polishing

Manufacturing Process: Investment Casting, Sand Casting (ASTM A351, A743, A744)

Plant: Own Foundry

After-sales Service: 24h Support

Warranty: Provided

Certification: CE, ISO 9001

Standard: ASTM, ASME, DIN, GB

Inspection: UT, MT, RT, hardness test, corrosion test, intergranular corrosion test

Application: Chemical processing, sulfuric acid equipment, phosphoric acid plants, pharmaceuticals, food processing, FGD, metal pickling, chloride & acidic slurry environments

Color: Custom

Delivery Time: 15–35 days (negotiable)

Packing: Steel frames, seaworthy wooden cases

Advantage: 20+ years foundry experience, professional technical team, full corrosion testing, export to 60+ countries

Our Photos Alloy 20 Corrosion Resistant Castings:

Alloy 20 (CN7M) Castings Chemical Composition

Element	C	Si	Mn	Cr	Ni	Mo	Cu	Nb	S	P	Fe
%	≤0.07	≤1.0	≤2.0	19.0–22.0	27.5–38.0	2.0–3.0	3.0–4.0	8*C–1.0	≤0.035	≤0.045	Balance

Key Features & Performance

Exceptional Acid Resistance: Outstanding performance in sulfuric acid (20–98%), phosphoric acid, nitric acid & organic acids
Chloride Immunity: Near-total resistance to chloride stress corrosion cracking (SCC); far superior to 316L
Localized Corrosion: Excellent resistance to pitting, crevice & intergranular corrosion (Nb-stabilized, weldable no post-heat treat)
Mechanical Strength: Tensile ≥550MPa, Yield ≥240MPa, Elongation ≥30% (stable to ~500°C)
Fabricability: Good castability, machinability & weldability (TIG/MIG, no preheat/post-weld heat treatment)

Typical Applications

Pump & valve components: casings, impellers, valve bodies, discs
Pressure vessels, reactors, heat exchangers, piping & flanges
Sulfuric/phosphoric acid equipment, metal pickling tanks
Pharmaceutical & food processing machinery (hygienic grade)
FGD systems, marine & brine handling, chemical storage

FAQ

Q: What is the casting grade for Alloy 20?

A: Cast version is CN7M (ASTM A351/A743); wrought is N08020/Carpenter 20.

Q: Is Alloy 20 weldable?

A: Yes—niobium stabilized prevents sensitization; no post-weld heat treatment required.

Q: How does it compare to 316L?

A: Far better in hot sulfuric acid & chloride SCC; 316L fails where Alloy 20 thrives.

Q: Can you cast complex parts?

A: Yes—investment/sand casting for custom pump/valve/process parts per your drawing.

Q: What tests do you perform?

A: 100% inspection: tensile, hardness, UT/MT, corrosion resistance, intergranular corrosion.

[everest_form id="249"]

[carousel_slide id='765']

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Alloy 20 Corrosion Resistant Castings

2026-04-22

Product: Superior acid & chloride corrosion resistance, weldable, high strength Alloy 20 (Carpenter 20) corrosion resistant castings

MOQ: 1 piece

Model NO: Customized

Size: As per drawing

Machining tolerance: +/-0.01mm

Application: Chemical, Petrochemical, Pharmaceutical, Food Processing, Acid Handling Equipment

Material: Alloy 20 (Carpenter 20, CN7M, UNS N08020, 2.4660, NS143)

Surface Treatment: Precision Machining, Passivation, Polishing

Manufacturing Process: Investment Casting, Sand Casting (ASTM A351, A743, A744)

Plant: Own Foundry

After-sales Service: 24h Support

Warranty: Provided

Certification: CE, ISO 9001

Standard: ASTM, ASME, DIN, GB

Inspection: UT, MT, RT, hardness test, corrosion test, intergranular corrosion test

Application: Chemical processing, sulfuric acid equipment, phosphoric acid plants, pharmaceuticals, food processing, FGD, metal pickling, chloride & acidic slurry environments

Color: Custom

Delivery Time: 15–35 days (negotiable)

Packing: Steel frames, seaworthy wooden cases

Advantage: 20+ years foundry experience, professional technical team, full corrosion testing, export to 60+ countries

Our Photos Alloy 20 Corrosion Resistant Castings:

Alloy 20 (CN7M) Castings Chemical Composition

Element	C	Si	Mn	Cr	Ni	Mo	Cu	Nb	S	P	Fe
%	≤0.07	≤1.0	≤2.0	19.0–22.0	27.5–38.0	2.0–3.0	3.0–4.0	8*C–1.0	≤0.035	≤0.045	Balance

Key Features & Performance

Exceptional Acid Resistance: Outstanding performance in sulfuric acid (20–98%), phosphoric acid, nitric acid & organic acids
Chloride Immunity: Near-total resistance to chloride stress corrosion cracking (SCC); far superior to 316L
Localized Corrosion: Excellent resistance to pitting, crevice & intergranular corrosion (Nb-stabilized, weldable no post-heat treat)
Mechanical Strength: Tensile ≥550MPa, Yield ≥240MPa, Elongation ≥30% (stable to ~500°C)
Fabricability: Good castability, machinability & weldability (TIG/MIG, no preheat/post-weld heat treatment)

Typical Applications

Pump & valve components: casings, impellers, valve bodies, discs
Pressure vessels, reactors, heat exchangers, piping & flanges
Sulfuric/phosphoric acid equipment, metal pickling tanks
Pharmaceutical & food processing machinery (hygienic grade)
FGD systems, marine & brine handling, chemical storage

FAQ

Q: What is the casting grade for Alloy 20?

A: Cast version is CN7M (ASTM A351/A743); wrought is N08020/Carpenter 20.

Q: Is Alloy 20 weldable?

A: Yes—niobium stabilized prevents sensitization; no post-weld heat treatment required.

Q: How does it compare to 316L?

A: Far better in hot sulfuric acid & chloride SCC; 316L fails where Alloy 20 thrives.

Q: Can you cast complex parts?

A: Yes—investment/sand casting for custom pump/valve/process parts per your drawing.

Q: What tests do you perform?

A: 100% inspection: tensile, hardness, UT/MT, corrosion resistance, intergranular corrosion.

[everest_form id="249"]

[carousel_slide id='765']