Stainless Steel for Custom Industrial Components
LANJIAN manufactures custom stainless steel castings, welded fabrications, and machined components to customer drawings. Material grade, standard, operating environment, surface condition, and required material records are reviewed for each project before production.
- Stainless Steel Grades Confirmed by Project
- Cast, Welded & Machined Components
- Material Requirements Reviewed Before Production
- Certificates & Material Verification When Specified
Scope: Custom industrial components manufactured from stainless steel—not raw material supply or stock standard parts.
What Stainless Steel Can LANJIAN Work With?
LANJIAN works with austenitic, martensitic and duplex stainless steel casting grades for custom components. Representative grades include CF8, CF8M, CA15 and CD3MN. The governing specification, casting section, heat-treatment condition and required testing are confirmed for each project.
Stainless Steel Type | Representative Grades | Material Profile | Suitable Conditions & Components |
Austenitic Stainless Steel | CF8 — 304-type | Corrosion: Good general corrosion resistance. The molybdenum in CF8M generally provides better pitting and crevice-corrosion resistance than CF8. | Environment: Water, process fluids and general corrosive service. Fluid composition, chloride concentration, pH and temperature must be reviewed. |
CF8M — 316-type | Mechanical: Good ductility and toughness. | Priority: Corrosion resistance and toughness. | |
Heat treatment: Normally supplied in the solution-treated condition and cannot be hardened by quenching and tempering. | Components: Pump and valve bodies, housings and covers. | ||
Martensitic Stainless Steel | CA15 — 410-type | Corrosion: Lower general corrosion resistance than common austenitic grades. | Environment: Applications involving mechanical load, wear or fluid erosion where moderate corrosion resistance is sufficient. |
Mechanical: Can provide higher strength, hardness and resistance to mechanical wear or fluid erosion. | Priority: Strength, hardness and wear resistance. | ||
Heat treatment: Final properties are controlled through hardening and tempering. | Components: Impellers, valve components, sleeves and other mechanically loaded castings. | ||
Duplex Stainless Steel | ASTM A890/A995: CD3MN / Grade 4A — 2205-type | Corrosion: Provides improved resistance to pitting, crevice corrosion and chloride stress-corrosion cracking compared with common austenitic grades. | Environment: Chloride-bearing process fluids and marine or chemical-service conditions. Actual concentration, temperature and operating stress must be reviewed. |
Mechanical: Higher strength with a combined austenitic-ferritic structure. | Priority: Combined corrosion resistance and mechanical strength. | ||
Heat treatment: Proper solution heat treatment and rapid cooling are required to control phase balance and corrosion performance. | Components: Pump and valve bodies, impellers, manifolds and fluid-handling castings. |
Cast grades identified as “304-type,” “316-type,” “410-type” or “2205-type” belong to similar material families but are not exact equivalents to their wrought counterparts.
Grades appearing under different ASTM specifications are not automatically interchangeable. The governing casting specification and acceptance criteria must be confirmed for each project.
For pressure-containing components, the applicable construction code, heat treatment, mechanical testing, NDT and documentation requirements must be agreed before production.
Stainless Steel Characteristics at a Glance
Stainless steel performance depends on the grade, heat-treatment condition, operating environment, manufacturing exposure, and final surface condition.
Corrosion Resistance Depends on Service Conditions
A chromium-rich passive film protects the surface. Chlorides, acidic media, stagnant crevices, elevated temperatures, and contamination can damage this film and cause pitting or crevice corrosion. Operating media, concentration, temperature, and chloride exposure should therefore be confirmed.
Strength and Hardness Vary by Stainless Steel Type
Austenitic grades cannot be hardened by conventional heat treatment but can gain strength through cold working. Martensitic grades can be hardened and tempered. Duplex grades are not conventionally hardened but generally provide higher strength than common austenitic grades.
Temperature Affects Strength and Corrosion Performance
Elevated temperature can reduce proof strength, accelerate oxidation, and increase corrosion rates. A grade suitable at ambient temperature is not automatically suitable for continuous high-temperature service. The allowable temperature should be checked against the specified grade and material standard.
Welding Requirements Differ by Grade
Austenitic grades are generally easier to weld. Martensitic grades may require controlled preheating, heat input, and post-weld treatment. Duplex grades require heat-input and filler-metal control to maintain the required phase balance. Visible weld heat tint can reduce local corrosion resistance.
Machining Behavior Depends on Material Condition
Austenitic stainless steels can work-harden rapidly and transfer heat away from the cutting area relatively slowly. This can increase tool wear and complicate chip control. Grade, hardness, delivery condition, critical features, and required surface finish should be confirmed before machining.
Surface Treatments Serve Different Purposes
Pickling removes oxide scale, weld heat tint, and the affected surface layer. Passivation removes free-iron contamination and supports the formation of a clean passive surface, but it does not remove heavy scale or heat tint. The required treatment should be specified according to the component’s service environment.
What Stainless Steel Requirements Should Be Confirmed?
“Stainless steel,” “304-type,” or “316-type” alone is not a complete material specification. Before production, the exact grade, governing standard, material form, service conditions, required properties, heat-treatment condition, surface condition, and verification documents should be confirmed.
What Should Be Confirmed | Why It Matters | Why It Matters | |||
Grade, Chemistry and Standard | Exact material designation, applicable ASTM, EN, GB, or customer specification, and any project-specific limits on chemical composition. | Similar grade names under different standards may have different composition, mechanical-property, or heat-treatment requirements. | |||
Material Form | Whether the material is a casting, plate, bar, forging, or another wrought form, together with the correct material designation. | Cast grades such as CF8 and CF8M are not directly interchangeable with wrought 304 and 316 designations. | |||
Service Environment | Process media, concentration, chloride content, pH, continuous and peak temperature, flow conditions, and possible crevice exposure. | Corrosion resistance depends on the actual operating environment—not on the grade name alone. | |||
Mechanical Properties and Heat Treatment | Required tensile or yield strength, elongation, hardness, impact properties, heat-treatment condition, cooling condition when specified, and any required microstructure or ferrite limits. | The same stainless steel grade can provide different properties depending on heat treatment and final material condition. | |||
Welding and Machining | Whether welding is required, any filler-metal or post-weld treatment requirements, final hardness, critical machined features, and functional surfaces. | Stainless steel types differ in weldability, work-hardening behavior, distortion response, and machining difficulty. | |||
Surface Condition |
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Verification and Documentation |
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The test method, sample location, sampling frequency, acceptance criteria, and report format for any additional verification should be agreed before production.
Stainless Steel FAQ
LANJIAN works with representative cast stainless steel grades including austenitic CF8 and CF8M, martensitic CA15, and duplex CD4MCu. The exact grade, governing standard, heat-treatment condition, and required properties must be confirmed for each component.
CF8 is an austenitic cast stainless steel commonly associated with wrought 304, while CF8M contains molybdenum and is commonly associated with wrought 316. The molybdenum in CF8M improves resistance to pitting and crevice corrosion in some chloride-bearing environments, but suitability still depends on concentration and temperature.
No. CF8 and CF8M are casting grades, while 304 and 316 normally refer to wrought materials such as plate or bar. They are related material families, but their chemical composition limits, mechanical-property requirements, and governing standards are not identical.
No. Austenitic grades such as CF8 and CF8M cannot be hardened by conventional heat treatment. Martensitic grades such as CA15 can be hardened and tempered, while duplex grades are not conventionally hardened but generally provide higher strength than common austenitic grades.
No stainless steel grade is universally resistant to chlorides. CF8M generally provides better localized corrosion resistance than CF8, while suitable duplex grades may be considered where higher strength and greater resistance to pitting, crevice corrosion, or erosion are required. Chloride concentration, temperature, pH, flow, and crevice conditions must be reviewed.
No. Pickling removes oxide scale, weld heat tint, and affected surface layers, while passivation removes free-iron contamination and supports a clean passive surface. The required treatment depends on the manufacturing condition, operating environment, cleanliness requirement, and drawing specification.
Yes. Martensitic and duplex stainless steels are normally magnetic. Austenitic stainless steel castings may also show magnetic response because of retained ferrite, and wrought austenitic material can become partly magnetic after cold working. Magnetism alone cannot verify a stainless steel grade.
The grade can be checked through heat-number traceability, material certificates, chemical analysis, and an agreed PMI method. PMI does not confirm mechanical properties or heat-treatment condition, and some handheld methods cannot measure carbon, so mechanical, hardness, or laboratory chemical testing may still be required.
Need the Right Stainless Steel for Your Component?
Send your drawing or available project details. LANJIAN will review the stainless steel grade, governing standard, service conditions, manufacturing form, surface requirements, and required material records before quotation.