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

Principal effects of major alloying elements for steel

 ElementPercentagePrimary function
Aluminium0.95–1.30Alloying element in nitriding steels
BismuthImproves machinability
Boron0.001–0.003(Boron steel) A powerful hardenability agent
Chromium0.5–2Increases hardenability
4–18Increases corrosion resistance
Copper0.1–0.4Corrosion resistance
LeadImproved machinability
Manganese0.25–0.40Combines with sulfur and with phosphorus to reduce the brittleness. Also helps to remove excess oxygen from molten steel.
>1Increases hardenability by lowering transformation points and causing transformations to be sluggish
Molybdenum0.2–5Stable 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.
12–20Increases corrosion resistance
Silicon0.2–0.7Increases strength
2.0Spring steels
Higher percentagesImproves magnetic properties
Sulfur0.08–0.15Free-machining properties
TitaniumFixes carbon in inert particles; reduces martensitic hardness in chromium steels
TungstenAlso increases the melting point.
Vanadium0.15Stable 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


Properties of Low Alloy Steel





Typical Mechanical Strength
(% in 2″)
Reduction of
Area (%)

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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