Stainless
AVAILABLE NOWStainless Steel Round Bar
304 / 304L, 316 / 316L, 17-4 PH and 416 stainless round bar cut to length and priced online, with plate by request. Austenitic, martensitic and precipitation-hardened grades for corrosion-critical and high-strength parts.
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At a glance
What is Stainless Steel Round Bar?
Stainless round bar is available online in four grades: 304 / 304L and 316 / 316L annealed, 17-4 PH in Condition A, and 416 annealed, from 1/2″ through 8″ diameter depending on grade. Every size is stocked as plain and DFARS-melt bar, cut to your length with mill certifications included. Plate in 304, 316 and 17-4 PH remains a sourced request.
Overview
Stainless steel is the appropriate material when aluminum lacks the corrosion resistance, elevated temperature capability, or surface hardness the application requires, and when the application does not yet demand the extreme conditions that push into nickel superalloy territory. Round bar in 304 / 304L, 316 / 316L, 17-4 PH and 416 is priced and ordered online from vendor stock in Troy, Michigan; plate in 304, 316 and 17-4 PH is sourced by request. Each grade represents a fundamentally different approach to the stainless design problem.
304 is the most widely produced stainless steel in the world. Its 18 percent chromium and 8 percent nickel composition (the basis for the 18-8 shorthand) produces excellent corrosion resistance in a broad range of environments at low cost. It is used for food processing equipment, architectural applications, and general chemical service. 316 adds 2 to 3 percent molybdenum, which dramatically improves resistance to chloride pitting and crevice corrosion. In marine environments and pharmaceutical applications where 304 would pit, 316 is the correct choice. Neither 304 nor 316 is hardenable by heat treatment; strength comes from cold work in the rolled plate.
17-4PH (UNS S17400) is a different class: a precipitation-hardened martensitic stainless that can be delivered in Condition A (solution annealed, relatively soft) and then aged to high hardness and strength after machining. This allows complex parts to be machined in the soft state and then aged to achieve tensile strengths from 115,000 psi (H1150) to over 200,000 psi (H900) depending on the aging cycle. The combination of high strength, corrosion resistance, and hardness makes it the standard for aerospace structural brackets, downhole tool bodies, and defense hardware where stainless is required but austenitic grades cannot provide adequate strength.
Tempers Available
304 / 316 round bar: Annealed (solution annealed, cold finished or peeled)
17-4PH round bar: Condition A (solution annealed; age after machining)
416 round bar: Annealed (free machining)
304 / 316: Annealed (2B or No. 1 finish)
17-4PH: Condition A (solution annealed, 150 ksi typical UTS)
17-4PH: H900 (aged 900°F, 190 ksi min UTS)
17-4PH: H925 (aged 925°F, 170 ksi min UTS)
17-4PH: H1025 (aged 1025°F, 155 ksi min UTS)
17-4PH: H1075 (aged 1075°F, 145 ksi min UTS)
17-4PH: H1150 (aged 1150°F, 115 ksi min UTS)
Material Origin
Available Forms
304 / 304L Round Bar
Annealed, dual-certified bar, 1/2″ to 8″ diameter. Pick a diameter and cut length in the 304 round bar catalog.
316 / 316L Round Bar
Annealed bar for chloride and marine service, 1/2″ to 8″ diameter. Pick a size in the 316 round bar catalog.
17-4 PH Round Bar
Condition A bar with DFARS-compliant melt, 1/2″ to 6″ diameter. Pick a size in the 17-4 PH round bar catalog.
416 Round Bar
Annealed free-machining bar, 1/2″ to 3″ diameter. Pick a size in the 416 round bar catalog.
304 / 316 / 17-4PH Plate
BY REQUESTThickness by request. Contact us with your requirements.
Mechanical Properties
| Temper / Condition | Tensile (min) | Yield (min) | Elongation (min) | Hardness |
|---|---|---|---|---|
| 304 — Annealed (plate) | 75,000 psi min | 30,000 psi min | 40% min | Brinell 201 max |
| 316 — Annealed (plate) | 75,000 psi min | 30,000 psi min | 40% min | Brinell 217 max |
| 17-4PH — H900 Highest strength condition; lower fracture toughness; not recommended for impact-critical applications | 190,000 psi min | 170,000 psi min | 10% min | Rockwell C 40 min |
| 17-4PH — H1025 Balanced strength and toughness; common aerospace condition | 155,000 psi min | 145,000 psi min | 12% min | Rockwell C 33 min |
| 17-4PH — H1150 Maximum ductility and toughness; lowest strength condition | 115,000 psi min | 75,000 psi min | 16% min | — |
Values are minimums per applicable specification unless noted as typical. Properties may vary by thickness, temper, and mill. Always verify against the applicable AMS or ASTM specification for your program.
Physical Properties
Specifications & Standards
AMS Specifications
ASTM / MIL Specifications
Machining Notes
Common Applications
Specify 316 over 304 for any application involving chloride exposure, saltwater, or acidic chemical service. Specify 17-4PH when corrosion resistance is required alongside structural strength that austenitic grades cannot provide. Machine 17-4PH in Condition A and age after.
Why NOX for Stainless
Related Materials
Related Materials
6061 Aluminum
The standard general-purpose structural alloy. Good machinability, weldability, and corrosion resistance across a wide range of applications.
7075 Aluminum
High-strength aerospace alloy. Among the highest tensile strength available in commercial aluminum at 73,000 psi minimum in T651.
7050 Aluminum
High-strength aluminum plate for thick-section aerospace machining. Select the alloy, temper and certification required by your drawing.
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