420 Stainless Steel Casting
420 Stainless Steel Investment Castings
Stainless steel alloy 420 is a martensitic alloy with high hardness compared to other stainless steel alloys. Its brittleness makes it commonly used for cutlery, machinery components such as bearings, gears and shafts, and valve components.
Chemical Composition of 420 Stainless Steel:
- Carbon (C): 0.15%
- Manganese (Mn): 1.00%
- Silicon (Si): 1.00%
- Chromium (Cr): 12.00-14.00%
- Phosphorus (P): 0.04%
- Sulfur (S): 0.03%
- Iron (Fe): Balance
Is SS 420 Corrosion Resistant?
420 stainless steel has a moderate level of corrosion resistance. However, it is lower than other stainless steels such as ss 316, which contains 3% molybdenum, and ss 304, which contains up to 21% chromium.
Stainless steel 420 has up to 14% chromium, still giving it decent corrosion resistance. However, it’s at the lower end of the sprectrum. Alloy 420 works best if you are looking for a stainless steel alloy with high hardness.
Industries & Applications
Industries & Applications of 420 Investment Castings:
420 stainless steel is used in a wide range of industries and functions, including but not limited to: Petrochemical, Pump & valve, Transportation components, Machine components, Spindles, Pipe fittings, Utensils & cutlery.
Additional Stainless Steel Grades
420 Stainless Steel Investment Casting Manufacturer
Whether you’re still in the beginning stages or if you’re ready for production, our team of professionals is equipped to give you their full attention for your investment casting project. Choose Milwaukee Precision Casting Inc. for quality parts, on time. Request a quote today!
Markets We Serve
Trusted by
Demanding Industries
Commercial Firearms & Military
Milwaukee Precision Casting, Inc. specializes in components for the firearm and gun industries through the investment casting process, producing military components, commonly for AR-15, M16, M240, and M249.
Power Transmission
Milwaukee Precision Casting, Inc. (MPC) is proud to serve the industry in many areas, producing power transmission component castings that pass stringent requirements for high-voltage substation power switching and storage equipment.
Medical
Investment castings used in medical-related applications require the highest degree of quality, cleanliness and surface finish.
Auto After Market
Milwaukee Precision Casting, Inc. has extensive exposure in the automotive aftermarket, the secondary market of the automotive industry. We specialize in the manufacturing of vehicle parts, tools, and accessories for light and heavy vehicles.
Food & Dairy
Milwaukee Precision Casting, Inc. plays a major role in the production of stainless steel investment castings used in the food & dairy industry.
Construction
Milwaukee Precision Casting, Inc. (MPC) produces construction component castings for tools and equipment used in the construction industry.
Meat Processing
Milwaukee Precision Casting, Inc. produces a wide array of standard and customized investment casting products for meat processing equipment, including meat grinder parts and special attachments for machinery.
Machine Tool
Milwaukee Precision Casting, Inc. produces quality investment castings for a wide range of applications in the machine tool industry.
Waste Management
Milwaukee Precision Casting, Inc. produces a wide array of standard and customized investment casting products for wastewater treatment equipment.
Mining
Milwaukee Precision Casting, Inc. has long supported the mining and earth-moving industry with mining investment castings built for tough, abrasive environments.
Logging
Milwaukee Precision Casting, Inc. produces a wide array of standard and customized investment casting solutions for the logging industry, including forestry equipment castings, heavy equipment castings, and off-highway machinery castings.
Oil & Gas
Investment castings used in the oil and gas industry must meet the highest standards of quality, durability, and corrosion resistance to withstand extreme operating conditions.Milwaukee Precision Casting produces stainless steel castings and A356 castings used in applications such as ramps, heavy-duty locks, flame and flow control, and even material removal fingers.
Utilities
Milwaukee Precision Casting, Inc. produces a wide array of standard and customized power generation investment castings for the utilities industry.
Agriculture
Agriculture equipment operates in tough, demanding environments, which is why investment castings have been a trusted solution in the industry for decades.
Petrochemical
At Milwaukee Precision Casting, Inc., we specialize in manufacturing high-performance investment castings for the petrochemical industry, where precision, durability, and safety are paramount.
Pumps & Valves
Milwaukee Precision Castings produces near-net shape, high-quality, durable investment castings for pumps and valves.
Linear Tolerances
The industry standard linear tolerances for any investment casting
process are ±.005 per
inch of length.
Geometric Tolerances
Effective part configuration is a critical element in achieving strict
tolerances for investment casting. Our team ensures a quality
experience in investment casting.
Minimal Lead Time
Built for complex applications requiring repeatable accuracy and tight dimensional control across production runs.
Accuracy of ± .005 per inch
ISO-certified quality systems with advanced inspection and full traceability from tooling to delivery.
AMS 2175 Compliance
Fast RFQ response, efficient tooling development, and scalable production capacity to meet your schedule.
Competitive Pricing
Cast, machine, finish, and inspect under one roof — reducing lead times and supply chain complexity.
ISO 9001:2015 Certified
DFM reviews and casting optimization from experienced engineers who understand your application requirements.
Advanced Inspection
X-ray, MPI, FPI, HIPing, and dimensional validation ensure every component meets your spec before shipment.
Get a Quote
Request a Precision
Casting Quote
We cast a broad range of alloys — from corrosion-resistant stainless grades to
high-strength tool steels — engineered for demanding industrial, defense, and
energy applications.
Fast RFQ Response
Typical quote turnaround within 1–2 business days
Engineering Support
DFM review and casting optimization included with every quote
Scalable Production
Prototype to high-volume production capability
Full Technical Consultation
Material selection, tolerance review, and process recommendations
