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Changzhou Fenglan New Materials Co., Ltd.

CNC Stainless Steel Part

-- Steady & Reliable Manufacturer --

Introduction

Stainless steel is the material of choice when a part must resist corrosion, maintain strength at elevated temperatures, and withstand aggressive cleaning chemicals — all at the same time. CNC machining delivers the dimensional precision and surface finish quality that stainless steel's demanding applications require, while modern carbide and ceramic tooling makes what was once considered a "difficult-to-machine" material a routine daily operation at Fenglan.

We machine all common stainless grades: 303 (free-machining, excellent surface finish), 304/304L (general corrosion resistance, the most widely used grade), 316/316L (enhanced chloride and acid resistance, the standard for marine and pharmaceutical use), 17-4 PH (precipitation-hardened, high-strength aerospace grade), and 2205 Duplex (for severe corrosion combined with high stress). Post-machining passivation in citric or nitric acid is offered to restore and maximize the corrosion resistance of machined surfaces.

Related Products

Specifications

Common Grades 303, 304/304L, 316/316L, 17-4 PH, 2205 Duplex, 440C
Tensile Strength 515 MPa (304) to 1310 MPa (17-4 PH H900)
Max Hardness (machined) Up to 38 HRC (17-4 PH); 22 HRC (316 cold-worked)
Dimensional Tolerance ±0.02 mm general; ±0.005 mm precision bores/shafts
Surface Roughness Ra 0.8 – 3.2 μm (standard); Ra 0.4 μm (fine); Ra 0.1 μm (polished/ground)
Part Size (Turning) ⌀3 mm – ⌀200 mm
Part Size (Milling) Up to 400 × 400 × 300 mm
Post-Machining Treatments Passivation (citric/nitric), electropolishing, PVD coating, bead blast, mirror polish
Certifications Available Material mill certs (EN 10204 3.1), RoHS, REACH, FDA-compliance statement
Thread Standards Metric, BSP, NPT, UNC, UNF, Trapezoidal

Applications

  • Food & Beverage Processing: 316L pump housings, impellers, valve bodies, and fittings in contact with food products or CIP (clean-in-place) chemicals.
  • Pharmaceutical & Biotech: Electropolished 316L fittings, reactor vessel nozzles, and fluid-path components meeting GMP and FDA guidelines.
  • Marine & Offshore: 316L and Duplex 2205 fasteners, pump shafts, and valve stems exposed to seawater, salt spray, and biofouling agents.
  • Chemical Processing: Pipe fittings, heat exchanger baffles, and reactor internals in acids, alkalis, and oxidizing environments.
  • Medical Devices: Surgical instruments, implant-trial components, and diagnostic equipment housings requiring sterilization compatibility (autoclave, EtO, gamma).
  • Aerospace & Defense: 17-4 PH high-strength structural fittings, landing gear components, and actuator rods where strength and weight efficiency are balanced.

Advantages

  • Outstanding Corrosion Resistance: 316L withstands chlorides, acids, and alkaline cleaners that would quickly destroy carbon steel or aluminum — minimizing maintenance cost and part replacement frequency.
  • High-Temperature Performance: Austenitic stainless steels retain useful strength to 800°C+ and resist scaling, making them suitable for exhaust systems, furnace components, and steam-line fittings.
  • Hygienic Surface Finish: Electropolishing reduces surface roughness to Ra ≤0.5 μm and removes embedded particles, creating a surface that bacteria cannot easily colonize — mandatory in pharmaceutical and food-grade piping.
  • Weldability (Low-Carbon Grades): 304L and 316L have <0.03% carbon, avoiding sensitization and intergranular corrosion in weld heat-affected zones.
  • Non-Magnetic Option: Annealed austenitic grades (304, 316) are non-magnetic, required in MRI equipment, sensitive measurement instruments, and certain military applications.

Payment & Shipping

Payment Terms: We accept T/T (wire transfer), L/C at sight, PayPal, and Western Union. A 30% deposit is required before production begins, with the remaining 70% settled before shipment. For established long-term customers, flexible credit arrangements can be discussed on a case-by-case basis.

Lead Time: Standard production lead time is 7–15 business days after deposit confirmation. For urgent orders, expedited scheduling may be available — please contact our sales team to check availability.

Shipping & Logistics: We ship worldwide via DHL, FedEx, UPS, TNT, and by sea (LCL or FCL). Incoterms supported include EXW, FOB Ningbo/Shanghai, CIF, and CFR. The most cost-effective option is selected based on order weight and destination.

Packaging: All items are individually inspected, then packed in anti-rust film and foam-lined export cartons. Custom branding, inner packaging, and labeling are available on request. Packaging fully complies with international freight standards.

Quality Assurance: Every shipment is accompanied by an inspection report and, where applicable, material certificates (e.g., RoHS, REACH). We support third-party inspection arrangements (SGS, BV, etc.) if required.

FAQ

  • Q: What is the difference between 304 and 316 stainless steel for machined parts?
  • A: Both are austenitic grades with similar machinability. The key difference is that 316 contains 2–3% molybdenum, which significantly improves resistance to pitting corrosion in chloride environments (seawater, road salt, cleaning agents). For most indoor industrial applications, 304 is sufficient and more cost-effective. For marine, coastal, chemical, and food/pharma environments, 316L is the correct choice.
  • Q: Why is machining stainless steel more expensive than brass or aluminum?
  • A: Stainless steel (especially 304/316) is tough and work-hardens rapidly, which increases cutting forces, generates heat, and accelerates tool wear compared to brass or aluminum. Slower cutting speeds, premium carbide tooling, and higher coolant flow rates all contribute to longer cycle times and higher tooling costs per part.
  • Q: Do you provide passivation as part of the standard process for stainless steel parts?
  • A: Passivation is available as an add-on treatment and is strongly recommended for parts in corrosive service. It removes free iron and other surface contaminants introduced during machining, restoring the chromium-oxide passive layer. We perform citric acid passivation in-house (ASTM A967 / AMS 2700 compliant) and can provide batch records for traceability.
  • Q: Can you machine hardened stainless steel grades like 17-4 PH in the H900 condition?
  • A: We prefer to machine 17-4 PH in the annealed (A condition) state and then send for precipitation hardening, which distorts less than machining after hardening. However, we can machine parts in the H900 or H1025 condition using CBN tooling for final-dimension operations if your heat-treatment sequence requires it — discuss this with our engineering team upfront.
Changzhou Fenglan New Materials Co., Ltd.
Changzhou Fenglan New Materials Co., Ltd.
Changzhou Fenglan New Materials Co., Ltd.
Changzhou Fenglan New Materials Co., Ltd.
Changzhou Fenglan New Materials Co., Ltd.
Changzhou Fenglan New Materials Co., Ltd.
Changzhou Fenglan New Materials Co., Ltd.
Changzhou Fenglan New Materials Co., Ltd.
ABOUT US
Quality is Our Core Competitiveness
Changzhou Fenglan New Materials Co., Ltd.
Founded in 2010, As China CNC Stainless Steel Part Manufacturers and CNC Stainless Steel Part Company. we are dedicated to manufacturing precision parts for automotive, industrial, and electrical applications. Backed by advanced manufacturing and R&D, we provide high-quality products and trusted solutions to our clients. We provide a wide selection of components to meet diverse industry needs: Electric Shafts: Drive shafts, coil motor shafts, servo motor shafts, water pump motor shafts, industrial motor shafts, and magnetic levitation motor shafts. Hardware: Precision parts for medical equipment, water heater coils, plumbing fittings, and various gas springs. Our commitment is to support our customers with reliable performance and long-term value.
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  • Changzhou Fenglan New Materials Co., Ltd.
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