Low Alloy Steel allowable stress at a glance with ASTM standard specification and equivalent grades.
Alloy Steel properties differ from alloy to alloy. It is a broad term and there are thousands of alloy steel materials available and are used for different purposes. There are different Alloy Steel grades that are derived through the different compositions of the different alloys. These alloys are basically steel with alloying material between 1% to 50% of the total composition in weight. The alloys could be divided into two subgroups. The high alloys and the low alloy steel. The low alloy steel has lower amounts of alloying material and high alloy steel has higher amounts of alloying material. The definition of what quantity is not definitive yet. The Alloy Steel applications range over a variety of industrial, domestic and commercial use cases. From household and kitchen accessories to larger industrial machine parts, the materials are used for their strength and cost effective nature.
Each alloy is different and some of them have excellent and unique properties that are applied in unique applications. The Alloy Steel advantages are that they could be used in place of high cost materials with the addition of elements and tweaking the chemical composition a little bit. So the cost is reduced to larger extents. The Alloy and its types are based on the composition and the cost is per kg. The Alloy Steel price per kg is much lower than the prices of other metal alloys or pure metals like titanium and copper. The Alloy Steel suppliers sell these products in combination with other metal products. AS are one of the most sold metallic products in the world. The AS composition can include a host of other elements such as manganese, molybdenum, chromium, nickel, silicon, nitrogen and a lot of others depending on the material in question. We are one of the best Alloy Steel manufacturers in India. And you can get the best pricing from us.
Available Sectional Forms
| Element | Percentage | Primary function |
|---|---|---|
| Aluminium | 0.95–1.30 | Alloying element in nitriding steels |
| Bismuth | – | Improves machinability |
| Boron | 0.001–0.003 | (Boron steel) A powerful hardenability agent |
| Chromium | 0.5–2 | Increases hardenability |
| 4–18 | Increases corrosion resistance | |
| Copper | 0.1–0.4 | Corrosion resistance |
| Lead | – | Improved machinability |
| Manganese | 0.25–0.40 | Combines with sulfur and with phosphorus to reduce the brittleness. Also helps to remove excess oxygen from molten steel. |
| >1 | Increases hardenability by lowering transformation points and causing transformations to be sluggish | |
| Molybdenum | 0.2–5 | Stable carbides; inhibits grain growth. Increases the toughness of steel, thus making molybdenum a very valuable alloy metal for making the cutting parts of machine tools and also the turbine blades of turbojet engines. Also used in rocket motors. |
| Nickel | 2–5 | Toughener |
| 12–20 | Increases corrosion resistance | |
| Silicon | 0.2–0.7 | Increases strength |
| 2.0 | Spring steels | |
| Higher percentages | Improves magnetic properties | |
| Sulfur | 0.08–0.15 | Free-machining properties |
| Titanium | – | Fixes carbon in inert particles; reduces martensitic hardness in chromium steels |
| Tungsten | – | Also increases the melting point. |
| Vanadium | 0.15 | Stable carbides; increases strength while retaining ductility; promotes fine grain structure. Increases the toughness at high temperatures |
Types of Alloy Steel
Chrome Molybdenum Alloy Steel| Uses & Application | Boilers, and otherequipments, suitable for high temperature |
| Common Grades | ASTM A387 Grade 5/ 11/ 12/ 9/ 91/ 22, ASTM A204, ASTM A302, SAE 4130, AISI 4140, SAE 8620, EN 36, EN 19, EN 24, EN 10028 -2 / DIN 17175 |
| Supply Condition | Annealed / Normalized, Tempered |
Alloy Steel ASTM Standard
| Pipes | Fitting | Flanges | Valves | Bolts and Nuts |
| ASTM A335 Grade P1 | A234 Grade WP1 | A182 Grade F1 | A217 Grade WC1 | |
| ASTM A335 Grade P11 | A234 Grade WP11 | A182 Grade F11 | A217 Grade WC6 | |
| ASTM A335 Grade P12 | A234 Grade WP12 | A182 Grade F12 | A217 Grade WC6 | |
| ASTM A335 Grade P22 | A234 Grade WP22 | A182 Grade F22 | A217 Grade WC9 | A193 Grade B7 A194 Grade 2H |
| ASTM A335 Grade P5 | A234 Grade WP5 | A182 Grade F5 | A217 Grade C5 | |
| ASTM A335 Grade P9 | A234 Grade WP9 | A182 Grade F9 | A217 Grade C12 | |
| ASTM A335 Grade P91 | A234 Grade WP91 | A182 Grade F91 |
Specification of Alloy Steel
| Grade | Specification | |
|---|---|---|
| AISI4130 | AMS 2301, 6370, 6348, MIL-S-6758 | |
| AISI4140 | AMS 2301, 6382, 6349, MIL-S-5626 | |
| 4330 | AMS 2301, 6427, MIL-S-8699, BMS-7-27 | |
| AS4330 | AMS 6427, 6411, MIL-S-8699, BMS-7-27, Melt, N&T AMS 2300, BMS-7-122 | |
| AISI4340 | AMS 2301, 6409, 6415, MIL-S-5000, BMS 7-28, DMS-1555 | |
| 9310 | AMS 2300, 6260, 6267, 6265, MIL-S-7393C | |
| 52100 | AMS 2301, 6440, MIL-S-7420 | |
Alloy Steel Temperature Range
Low Alloy (Temp range -29° C to 593° C):- Carbon 1/2% Moly and Manganese 1/2% Moly : above 700 degree F
- 1 1/4% Chrome 1/2% Moly & 1% chrome 1/2% Moly
- 3% chrome 1% Moly & 2 1/4 Chrome 1% Moly
- 5% chrome 1/2% Moly : above 550 degree F
- 9% Chrome 1% Moly
Low Alloy Steel Applications & Uses
- Structural applications
- Aircraft
- Power transmissions
- Structural parts
Alloy Steel Composition
| AISI | UNS | C (max) | Mn (max) | P (max) | S (max) | Si | Cr | Ni | Cu | Others |
|---|---|---|---|---|---|---|---|---|---|---|
| 405 | S40500 | 0.08% | 1% | 0.04% | 0.03% | 1% | 11.5-14.5% | – | – | 1-3% Aluminum |
| 430 | S43000 | 0.12% | 1% | 0.04% | 0.03% | 1% | 16-18% | – | – | – |
Properties of Low Alloy Steel
AISI |
UNS | Typical Mechanical Strength | ||||
|---|---|---|---|---|---|---|
| Tensile (ksi) | Yield (ksi) | Elongation (% in 2″) | Reduction of Area (%) | Brinell Hardness | ||
| 4130 | G41300 | 80 | 56 | 28 | 57 | 149 |
| 4140 | G41400 | 150 | 90 | 20 | 45 | 285 |
| 4330 | G43300 | 125 | 100 | 15 | 30 | 250-325 |
| 4340 | G43400 | 110 | 66 | 23 | 49 | 197 |
We at RMT produce high quality Steel Pipes and tubes at best price, choose the pipes in your required sizes. We accept all large and small orders happily. You can contact us for ready stock and sizes, for urgent deliveries please mail to info@rmtindustry.com. We stock wide range of steel pipes, tubes, sheets, plates, round bars, rods, flat products, pipe fittings -buttweld / forged, fasteners in all materials and shapes for industrial purpose. We supply these piping product globally along with mill and test certificates. We supply these piping material in stainless steel, carbon steel, alloy steel, aluminium, copper and copper nickel and special steel grades, visit our Alloys section for detailed information. We also deal in hard to find materials.
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