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AISI Steel
Specifications
At West Yorkshire Steel we can supply you with AISI steel grades and also AISI equivalent grades to British & European standards. Please contact us with your specific requirements and we shall endeavour to help.
AISI steel grades (American Iron & Steel Institute) are becoming increasingly popular in the UK, primarily due to their use in the oil and gas industry. We hold a comprehensive range of stock in AISI material and AISI equivalent specifications. Of AISI steel grades available the majority are as carbon steels and alloy steels. AISI carbon steels and alloy steels are usually given a four digit number, the first two digits indicate the alloying element in the AISI specification and the last two digits indicate the amount of carbon in the specification. AISI materials grades are shown in the table below, as to how the four digit number indicates the type it refers to.
Carbon Steel
10XX
Plain carbon steel , Mn 1.00% max
11XX
Resulphurised free cutting
12XX
Resulphurised - Rephosphorised free cutting
15XX
Plain carbon steel, Mn 1.00-1.65%
Manganese Steel
13XX
Mn 1.75%
Nickel Steel
23XX
Ni 3.50%
25XX
Ni. 5.00%
Nickel Chromium Steel
31XX
Ni 1.25%, Cr 0.65-0.80%
32XX
Ni 1.75%, Cr 1.07%
33XX
Ni 3.50%, Cr 1.50-1.57%
34XX
Ni 3.00%, Cr 0.77%
Molybdenum Steel
40XX
Mo 0.20-0.25%
44XX
Mo 0.40-0.52%
Chromium Molybdenum Steel
41XX
Cr 0.50-0.95%, Mo 0.12-0.30%
Nickel Chromium Molybdenum Steel
43XX
Ni 1.82%, Cr 0.50-0.80%, Mo 0.25%
47XX
Ni 1.82%, Cr 0.50-0.80%, Mo 0.25%
Nickel Molybdenum Steel
46XX
Ni 1.05%, Cr 0.45%, Mo 0.20-0.35%
48XX
Ni 0.85-1.82%, Mo 0.20-0.25%
Chromium Steel
50XX
Ni 3.50%, Mo 0.25%
51XX
Cr 0.27-0.65%
50XXX
Cr 0.80-1.05%
51XXX
Cr 0.50% C 1.00% min
52XXX
Cr 1.02%, C 1.00% minCr 1.45%, C 1.00%
Chromium Vanadium Steel
61XX
Cr 0.60-0.95%, V 0.10-0.15%
Tungsten Chromium Steel
72XX
W 1.75%, Cr 0.75%
Nickel Chromium Molybdenum Steel
81XX
Ni 0.30%, Cr 0.40%, Mo 0.12%
86XX
Ni 0.55%, Cr 0.50%, Mo 0.20%
87XX
Ni 0.55%, Cr 0.50%, Mo 0.25%
88XX
Ni 0.55% Cr 0.50% Mo 0.35%
Silicon Manganese Steel
92XX
Si 1.40-2.00%, Mn 0.65-0.85% Cr 0.65%
Nickel Chromium Molybdenum Steel
93XX
Ni 3.25%, Cr 1.20%, Mo 0.12%
94XX
Ni 0.45%, Cr 0.40%, Mo 0.12%
97XX
Ni 0.55%, Cr 0.20%, Mo 0.20%
98XX
Ni 1.00%, Cr 0.80%, Mo 0.25%
It is possible that AISI grades are quoted as SAE grades and it is often that AISI/SAE have the same steel identification number. The AISI range of steel specifications also includes stainless steels which are 3 digit numbers starting with either a 2, 3, 4, or 5. The most popular of these being the 300 series austenitic stainless grades, followed by the 400 series martensitic grades. Also stocked are AISI equivalent grades of tool steel and high speed steel. AISI tool steel and high speed steel specifications are usually designated with a letter followed by 1 or 2 digits.
AISI steel specifications L6 O2 1015 4130 1018 4140 4145 6150 1035 1040 1042 1050 1055 1060 410 410S 420 431 440B 440C 630 660 316 316L 304 303 301 304L 321 310 310S O1 D2 D3 D6 A2 H13 S1 P20 M2 M42 W2 W1 1213 E71400 E71406