410 Stainless Steel (UNS S41000)
The basic hardenable stainless: 12 percent chromium, heat treatable to 120 ksi and beyond, magnetic, and corrosion resistant in mild atmospheres — for valve trim, pump parts and high-strength stainless bolts.
What 410 Stainless is.
Type 410 is a martensitic stainless steel with about 12 percent chromium and enough carbon to harden by quenching and tempering. Unlike the austenitic grades it is magnetic, can be heat treated to strength levels that rival alloy steel, and has only moderate corrosion resistance, adequate for fresh water, steam and mild atmospheres but not chlorides. Hardness and strength are set by the tempering temperature.
We machine 410 fasteners and components from certified A276 bar and heat treat to the condition ordered: A276 Condition T or H for bar, and F593 Alloy Group 5 conditions H or HT for bolts. For high-temperature pressure bolting the related 12-chrome grade is ASTM A193 B6.
Chemical composition.
| Element | Symbol | Min % | Max % |
|---|---|---|---|
| Carbon | C | 0.08 | 0.15 |
| Manganese | Mn | — | 1.00 |
| Phosphorus | P | — | 0.040 |
| Sulfur | S | — | 0.030 |
| Silicon | Si | — | 1.00 |
| Chromium | Cr | 11.5 | 13.5 |
Values per ASTM A276/A276M-17 Tables 1 and 2 (verified against the specification). Confirm the edition called out on your purchase order with our estimating team.
Mechanical properties.
| Condition and nominal diameter (in.) | Tensile strength, min (ksi) | Yield strength 0.2% offset, min (ksi) | Elongation, min (%) | Reduction of area, min (%) | Hardness |
|---|---|---|---|---|---|
| Condition A (annealed), hot finished — all | 70 | 40 | 20 | 45 | — |
| Condition A, cold finished — all | 70 | 40 | 16 | 45 | — |
| Condition T (tempered high), hot finished — all | 100 | 80 | 15 | 45 | — |
| Condition T, cold finished — all | 100 | 80 | 12 | 40 | — |
| Condition H (tempered low), hot finished — all | 120 | 90 | 12 | 40 | — |
| Condition H, cold finished — rounds | 120 | 90 | 12 | 40 | — |
Values per ASTM A276/A276M-17 Tables 1 and 2 (verified against the specification). Confirm the edition called out on your purchase order with our estimating team.
| F593 condition · marking | Nominal diameter (in.) | Tensile strength (ksi) | Yield strength, min (ksi) | Rockwell hardness |
|---|---|---|---|---|
| H (hardened, tempered ≥1050 °F) · F593P | ¼ to 1½ | 110 to 140 | 90 | C20 to C30 |
| HT (hardened, tempered ≥525 °F) · F593R | ¼ to 1½ | 160 to 190 | 120 | C34 to C45 |
Values per ASTM F593-24 Table 2, full-size tests (verified against the specification). Yield is 0.2 % offset; hardness is Rockwell. Machined-specimen limits differ slightly.
Specifications that apply.
How 410 Stainless ships from Houston.
- Hex and heavy hex bolts and cap screws
- Full-thread studs and threaded rod
- Socket head cap and set screws
- Hex, jam and lock nuts
- Washers and spacers
- Machined components from certified bar
410 Stainless fasteners we make.
Every item is manufactured to your drawing or standard in 410 Stainless, imperial or metric, with an EN 10204 3.1 certificate.
What is 410 stainless steel?
410 is the general-purpose martensitic stainless. With 11.5 to 13.5 percent chromium it is just stainless enough to resist rusting in mild atmospheres and steam, and with 0.08 to 0.15 percent carbon it transforms to martensite on quenching, so it can be heat treated like an alloy steel. It is magnetic in every condition and its corrosion resistance is best after a high-temperature temper and a polish.
Choosing the condition
- Annealed (A276 Condition A): 70 ksi, for machining and where strength does not matter.
- Tempered 1050 °F and above (A276 Condition T, F593 H): 100 ksi minimum in bar, 110 to 140 ksi as F593 bolts, with good toughness. The usual choice for bolts and valve parts.
- Tempered low (A276 Condition H, F593 HT): 120 ksi minimum in bar, 160 to 190 ksi as F593 bolts, for wear parts and highly loaded fasteners, at some cost in toughness.
- Never temper between 700 and 1050 °F: the alloy embrittles and loses corrosion resistance in that range.
Testing, certification and marking
- Tensile and hardness tested per lot on the finished product
- Grade or marking symbol F593P or F593R and manufacturer's identification on every piece
- EN 10204 3.1 material test report with heat number and chemistry; 3.2 witness available
- PMI verification on request
416 Free-Machining Stainless Steel (UNS S41600)
410 with sulfur added — the most machinable of all stainless steels, heat treatable to 190 ksi bolts, for turned pins, shafts, fittings and set screws.
ASTM A276 bar · ASTM F593 bolts431 Stainless Steel (UNS S43100)
The strongest and most corrosion resistant of the common martensitic grades: 16 percent chromium with nickel, heat treatable to 220 ksi bolts, for marine shafts, pump parts and high-strength stainless fasteners.
ASTM A193 / ASME SA-193ASTM A193 Grade B6 (410 Stainless)
Hardenable 410 stainless bolting — 110 ksi with corrosion resistance B7 lacks, for valve trim, steam and mildly corrosive service.