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AISI Steel
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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.
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Carbon Steel
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10XX
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Plain carbon steel , Mn 1.00% max
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11XX
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Resulphurised free cutting
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12XX
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Resulphurised - Rephosphorised free cutting
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15XX
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Plain carbon steel, Mn 1.00-1.65%
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Manganese Steel
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13XX
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Mn 1.75%
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Nickel Steel
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23XX
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Ni 3.50%
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25XX
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Ni. 5.00%
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Nickel Chromium Steel
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31XX
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Ni 1.25%, Cr 0.65-0.80%
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32XX
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Ni 1.75%, Cr 1.07%
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33XX
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Ni 3.50%, Cr 1.50-1.57%
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34XX
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Ni 3.00%, Cr 0.77%
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Molybdenum Steel
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40XX
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Mo 0.20-0.25%
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44XX
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Mo 0.40-0.52%
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Chromium Molybdenum Steel
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41XX
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Cr 0.50-0.95%, Mo 0.12-0.30%
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Nickel Chromium Molybdenum Steel
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43XX
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Ni 1.82%, Cr 0.50-0.80%, Mo 0.25%
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47XX
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Ni 1.82%, Cr 0.50-0.80%, Mo 0.25%
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Nickel Molybdenum Steel
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46XX
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Ni 1.05%, Cr 0.45%, Mo 0.20-0.35%
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48XX
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Ni 0.85-1.82%, Mo 0.20-0.25%
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Chromium Steel
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50XX
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Ni 3.50%, Mo 0.25%
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51XX
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Cr 0.27-0.65%
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50XXX
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Cr 0.80-1.05%
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51XXX
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Cr 0.50% C 1.00% min
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52XXX
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Cr 1.02%, C 1.00% minCr 1.45%, C 1.00%
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Chromium Vanadium Steel
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61XX
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Cr 0.60-0.95%, V 0.10-0.15%
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Tungsten Chromium Steel
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72XX
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W 1.75%, Cr 0.75%
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Nickel Chromium Molybdenum Steel
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81XX
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Ni 0.30%, Cr 0.40%, Mo 0.12%
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86XX
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Ni 0.55%, Cr 0.50%, Mo 0.20%
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87XX
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Ni 0.55%, Cr 0.50%, Mo 0.25%
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88XX
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Ni 0.55% Cr 0.50% Mo 0.35%
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Silicon Manganese Steel
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92XX
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Si 1.40-2.00%, Mn 0.65-0.85% Cr 0.65%
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Nickel Chromium Molybdenum Steel
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93XX
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Ni 3.25%, Cr 1.20%, Mo 0.12%
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94XX
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Ni 0.45%, Cr 0.40%, Mo 0.12%
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97XX
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Ni 0.55%, Cr 0.20%, Mo 0.20%
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98XX
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Ni 1.00%, Cr 0.80%, Mo 0.25%
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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.
    
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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
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