---
title: "310S Stainless Steel Equal Angle | Laxcon Steels"
source: "https://www.laxconsteels.com/products/hrap-equal-angles/aisi-310s/"
description: "AISI 310S stainless steel equal angle, made to order by Laxcon Steels, India: composition, equivalents, weight per metre and tolerances."
---
# AISI 310S Equal Angles

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AISI 310S equal angle is a high chromium, high nickel austenitic angle for framework and supports that stay hot in service.

20 x 20 to 127 x 127 mm Austenitic stainless steel Made to order

## AISI 310S equal angle

AISI 310S equal angle is a rolled angle section in an austenitic stainless steel made for parts that work at high temperature. The grade carries more chromium and more nickel than the common austenitic grades: the chromium forms the oxide film that resists scaling in hot air and combustion gases, and the nickel keeps the structure austenitic, so the section does not change structure as it heats and cools. AISI 309S, the grade one step below, holds less of both elements and scales at a lower temperature. AISI 310 has the same chromium and nickel range but allows carbon up to 0.25 percent, while 310S caps carbon at 0.08 percent, so less chromium carbide forms at the grain boundaries when the angle is welded.

The angle is supplied hot rolled, annealed and pickled: annealing heats the steel until the carbides return into the metal, and the acid bath takes off the scale that rolling leaves. Annealed 310S is non-magnetic and takes no hardening from heat treatment; cold work is the only route to more strength. The minima of ASTM A276, which covers hot rolled shapes as well as bars, are 515 MPa tensile and 205 MPa yield. The grade work hardens quickly, so sawing and drilling ask for sharp tools, a firm feed and lower speeds than carbon steel. It is welded with a matching 310 filler and without preheat. Equal angle in this grade is fabricated into furnace and kiln framework, hearth and tray supports, heat treatment baskets and fixtures, and brackets in flue gas ducting.

Composition limits in weight percent are carbon 0.08 maximum, manganese 2.0 maximum, sulphur 0.03 maximum, phosphorus 0.045 maximum, silicon 1.5 maximum, chromium 24.0 to 26.0 and nickel 19.0 to 22.0.

## AISI 310S equal angle supply conditions

| Property | Value |
| --- | --- |
| Length | Up to 6.4 metres |
| Tolerances | ASTM A484, EN10056 |
| Supply condition | Hot rolled, Annealed & Pickled (HRAP) |
| Grit polish | As per customer’s request |
| Bars End Finish | Deburred Ends, Plain Ends without Burrs or Sharp Edges |
| Grade | AISI 310 S (310S, SUS 310S, 1.4845, S31008) |
| Family | Austenitic stainless steel |
| Supply | Made to order in this grade; every published size of the form |

## Composition of AISI 310S

| Element | Symbol | Minimum % | Maximum % |
| --- | --- | --- | --- |
| Carbon | C |  | 0.08 |
| Manganese | Mn |  | 2.0 |
| Sulphur | S |  | 0.03 |
| Phosphorus | P |  | 0.045 |
| Silicon | Si |  | 1.5 |
| Chromium | Cr | 24.0 | 26.0 |
| Nickel | Ni | 19.0 | 22.0 |

Composition, weight percent, balance iron. From the Laxcon Steels grade reference.

## Equivalents of AISI 310S

| Standard | Designation |
| --- | --- |
| UNS | S31008 |
| EN number | 1.4845 |

Equivalence means nearest counterpart, not identity: each standards body sets its own composition window, so the limits of the standard named on the order govern.

## Pitting resistance

The pitting resistance equivalent number of AISI 310S runs from 24.0 at the specified minimum chromium, molybdenum and nitrogen to 26.0 at the maxima, computed as PREN = Cr + 3.3Mo + 16N (International Molybdenum Association). It ranks resistance to chloride pitting against other austenitic and duplex grades and nothing else: it does not predict crevice corrosion, stress corrosion cracking or service life. The [pitting resistance reference](https://www.laxconsteels.com/grades/pitting-resistance/) carries the full table.

## Governing standards

| Property | Value |
| --- | --- |
| EN 10088-3 | Stainless steels: technical delivery conditions for semi-finished products, bars, rods, wire, sections and bright products for general purposes. Composition, heat treatment condition and mechanical properties per grade. |
| EN 10056-1 and 10056-2 | Structural steel equal and unequal leg angles: dimensions (part 1) and tolerances on shape and dimensions (part 2). |
| ASTM A276/A276M | Stainless steel bars and shapes: composition, condition, mechanical properties and finish designations for hot-finished and cold-finished bar. |
| ASTM A484/A484M | General requirements for stainless steel bars, billets and forgings: permissible variations in dimensions, straightness, weight and length, and the test and marking requirements every bar order inherits. |
| EN 10204 | Metallic products, types of inspection documents: the 2.2 test report and the 3.1 and 3.2 inspection certificates a purchase order can call for. |

## Weight per metre

| Section (mm) | Thickness (mm) | kg per metre |
| --- | --- | --- |
| 20 x 20 | 3 | 0.88 |
| 25 x 25 | 3 | 1.11 |
| 25 x 25 | 4 | 1.45 |
| 25 x 25 | 5 | 1.78 |
| 25 x 25 | 6 | 2.09 |
| 30 x 30 | 3 | 1.35 |
| 30 x 30 | 4 | 1.77 |
| 30 x 30 | 5 | 2.17 |
| 31.75 x 31.75 | 3.17 | 1.51 |
| 31.75 x 31.75 | 4.76 | 2.21 |
| 31.75 x 31.75 | 6.35 | 2.87 |
| 38.1 x 38.1 | 3.17 | 1.83 |
| 38.1 x 38.1 | 4.76 | 2.69 |
| 38.1 x 38.1 | 6.35 | 3.50 |
| 40 x 40 | 3 | 1.82 |
| 40 x 40 | 4 | 2.40 |
| 40 x 40 | 5 | 2.96 |
| 40 x 40 | 6 | 3.51 |
| 50 x 50 | 3 | 2.30 |
| 50 x 50 | 4 | 3.03 |
| 50 x 50 | 5 | 3.75 |
| 50 x 50 | 6 | 4.46 |
| 50 x 50 | 7 | 5.14 |
| 50 x 50 | 9 | 6.47 |
| 50 x 50 | 9.52 | 6.80 |
| 50 x 50 | 10 | 7.11 |
| 60 x 60 | 5 | 4.54 |
| 60 x 60 | 6 | 5.40 |
| 60 x 60 | 7 | 6.25 |
| 60 x 60 | 8 | 7.08 |
| 60 x 60 | 9 | 7.89 |
| 63 x 63 | 5 | 4.78 |
| 63 x 63 | 6 | 5.69 |
| 63 x 63 | 7 | 6.58 |
| 63 x 63 | 8 | 7.46 |
| 63.5 x 63.5 | 4.76 | 4.60 |
| 63.5 x 63.5 | 6.35 | 6.05 |
| 63.5 x 63.5 | 9.52 | 8.84 |
| 65 x 65 | 5 | 4.94 |
| 65 x 65 | 6 | 5.88 |
| 75 x 75/76.2 x 76.2 | 5 | 5.73 |
| 75 x 75/76.2 x 76.2 | 6 | 6.83 |
| 75 x 75/76.2 x 76.2 | 9 | 10.03 |
| 75 x 75/76.2 x 76.2 | 10 | 11.06 |
| 80 x 80 | 6 | 7.30 |
| 80 x 80 | 8 | 9.61 |
| 100/101.6 MM | 6 | 9.20 |
| 100/101.6 MM | 9 | 13.58 |
| 100/101.6 MM | 10 | 15.01 |
| 120 x 120 | 10 | 18.17 |
| 120 x 120 | 12 | 21.61 |
| 120 x 120 | 13 | 23.31 |
| 120 x 120 | 15 | 26.66 |
| 125 x 125 | 10 | 18.96 |
| 125 x 125 | 12 | 22.56 |
| 127 x 127 | 9.52 | 18.39 |
| 127 x 127 | 12.7 | 24.21 |

Density 7.90 g/cm³, the section treated as the two legs with the overlap counted once. Root fillets and toe radii are not in the formula, so a rolled angle weighs 1.3 to 2.8 percent more than the figure shown.

## Ordering AISI 310S equal angle

An enquiry for this grade in this form states the grade and the governing standard, for example AISI 310S to ASTM A276 or EN 10088-3, the annealed and pickled condition, the leg size and thickness with the tolerance to EN 10056-2 or ASTM A484, the length, the quantity, the test certificate type to EN 10204, and any test called for, such as positive material identification to confirm the grade on the piece. Laxcon Steels rolls the angle to order.

## Other grades in Equal Angles

- [**AISI 304** The general purpose austenitic stainless steel](https://www.laxconsteels.com/products/hrap-equal-angles/aisi-304/)
- [**AISI 316** The molybdenum-bearing austenitic grade](https://www.laxconsteels.com/products/hrap-equal-angles/aisi-316/)

## AISI 310S in other forms

- [**Hot Rolled Round Bars** hot rolled round bar](https://www.laxconsteels.com/products/hot-rolled-round-bars/aisi-310s/)

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