Alloy Steel Composition Chart

Chemical composition limits for the SAE-AISI low-alloy grades, quoted as ladle or cast analysis in weight percent. The table runs from the 13xx manganese series through the 40xx molybdenum, 41xx chromium-molybdenum, 43xx to 48xx nickel-chromium-molybdenum, 51xx chromium, 61xx chromium-vanadium, 81xx to 94xx and 92xx silicon grades, with the SAE potential standard PS grades in a second table.

wt % ladle or cast analysis

Composition limits for billets, blooms, slabs and hot-rolled or cold-finished bars. Slightly wider ranges apply to plate. Table 19 of the source.

SAE-AISI	UNS	C	Mn	P	S	Si	Ni	Cr	Mo	V
1330	G13300	0.28–0.33	1.60–1.90	0.035	0.040	0.15–0.35	—	—	—	—
1335	G13350	0.33–0.38	1.60–1.90	0.035	0.040	0.15–0.35	—	—	—	—
1340	G13400	0.38–0.43	1.60–1.90	0.035	0.040	0.15–0.35	—	—	—	—
1345	G13450	0.43–0.48	1.60–1.90	0.035	0.040	0.15–0.35	—	—	—	—
4023	G40230	0.20–0.25	0.70–0.90	0.035	0.040	0.15–0.35	—	—
4024	G40240	0.20–0.25	0.70–0.90	0.035	0.035–0.050	0.15–0.35	—	—	0.20–0.30	—
4027	G40270	0.25–0.30	0.70–0.90	0.035	0.040	0.15–0.35	—	—	0.20–0.30	—
4028	G40280	0.25–0.30	0.70–0.90	0.035	0.035–0.050	0.15–0.35	—	—	0.20–0.30	—
4032	G40320	0.30–0.35	0.70–0.90	0.035	0.040	0.15–0.35	—	—	0.20–0.30	—
4037	G40370	0.35–0.40	0.70–0.90	0.035	0.040	0.15–0.35	—	—	0.20–0.30	—
4042	G40420	0.40–0.45	0.70–0.90	0.035	0.040	0.15–0.35	—	—	0.20–0.30	—
4047	G40470	0.45–0.50	0.70–0.90	0.035	0.040	0.15–0.35	—	—	0.20–0.30	—
4118	G41180	0.18–0.23	0.70–0.90	0.035	0.040	0.15–0.35	—	0.40–0.60	0.08–0.15	—
4130	G41300	0.28–0.33	0.40–0.60	0.035	0.040	0.15–0.35	—	0.80–1.10	0.15–0.25	—
4135	G41350	0.33–0.38	0.70–0.90	0.035	0.040	0.15–0.35	—	0.80–1.10	0.15–0.25	—
4137	G41370	0.35–0.40	0.70–0.90	0.035	0.040	0.15–0.35	—	0.80–1.10	0.15–0.25	—
4140	G41400	0.38–0.43	0.75–1.00	0.035	0.040	0.15–0.35	—	0.80–1.10	0.15–0.25	—
4142	G41420	0.40–0.45	0.75–1.00	0.035	0.040	0.15–0.35	—	0.80–1.10	0.15–0.25	—
4145	G41450	0.41–0.48	0.75–1.00	0.035	0.040	0.15–0.35	—	0.80–1.10	0.15–0.25	—
4147	G41470	0.45–0.50	0.75–1.00	0.035	0.040	0.15–0.35	—	0.80–1.10	0.15–0.25	—
4150	G41500	0.48–0.53	0.75–1.00	0.035	0.040	0.15–0.35	—	0.80–1.10	0.15–0.25	—
4161	G41610	0.56–0.64	0.75–1.00	0.035	0.040	0.15–0.35	—	0.70–0.90	0.25–0.35	—
4320	G43200	0.17–0.22	0.45–0.65	0.035	0.040	0.15–0.35	1.65–2.00	0.40–0.60	0.20–0.30	—
4340	G43400	0.38–0.43	0.60–0.80	0.035	0.040	0.15–0.35	1.65–2.00	0.70–0.90	0.20–0.30	—
E4340^(b)	G43406	0.38–0.43	0.65–0.85	0.025	0.025	0.15–0.35	1.65–2.00	0.70–0.90	0.20–0.30	—
4422	G44220	0.20–0.25	0.70–0.90	0.035	0.040	0.15–0.35	—	—	0.35–0.45	—
4427	G44270	0.24–0.29	0.70–0.90	0.035	0.040	0.15–0.35	—	—	0.35–0.45	—
4615	G46150	0.13–0.18	0.45–0.65	0.035	0.040	0.15–0.25	1.65–2.00	—	0.20–0.30	—
4617	G46170	0.15–0.20	0.45–0.65	0.035	0.040	0.15–0.35	1.65–2.00	—	0.20–0.30	—
4620	G46200	0.17–0.22	0.45–0.65	0.035	0.040	0.15–0.35	1.65–2.00	—	0.20–0.30	—
4626	G46260	0.24–0.29	0.45–0.65	0.035	0.04 max	0.15–0.35	0.70–1.00	—	0.15–0.25	—
4718	G47180	0.16–0.21	0.70–0.90	—	—	—	0.90–1.20	0.35–0.55	0.30–0.40	—
4720	G47200	0.17–0.22	0.50–0.70	0.035	0.040	0.15–0.35	0.90–1.20	0.35–0.55	0.15–0.25	—
4815	G48150	0.13–0.18	0.40–0.60	0.035	0.040	0.15–0.35	3.25–3.75	—	0.20–0.30	—
4817	G48170	0.15–0.20	0.40–0.60	0.035	0.040	0.15–0.35	3.25–3.75	—	0.20–0.30	—
4820	G48200	0.18–0.23	0.50–0.70	0.035	0.040	0.15–0.35	3.25–3.75	—	0.20–0.30	—
50B40^(c)	G50401	0.38–0.43	0.75–1.00	0.035	0.040	0.15–0.35	—	0.40–0.60	—	—
50B44^(c)	G50441	0.43–0.48	0.75–1.00	0.035	0.040	0.15–0.35	—	0.40–0.60	—	—
5046	G50460	0.43–0.48	0.75–1.00	0.035	0.040	0.15–0.35	—	0.20–0.35	—	—
50B46^(c)	G50461	0.44–0.49	0.75–1.00	0.035	0.040	0.15–0.35	—	0.20–0.35	—	—
50B50^(c)	G50501	0.48–0.53	0.75–1.00	0.035	0.040	0.15–0.35	—	0.40–0.60	—	—
5060	G50600	0.56–0.64	0.75–1.00	0.035	0.040	0.15–0.35	—	0.40–0.60	—	—
50B60^(c)	G50601	0.56–0.64	0.75–1.00	0.035	0.040	0.15–0.35	—	0.40–0.60	—	—
5115	G51150	0.13–0.18	0.70–0.90	0.035	0.040	0.15–0.35	—	0.70–0.90	—	—
5117	G51170	0.15–0.20	0.70–0.90	0.040	0.040	0.15–0.35	—	0.70–0.90	—	—
5120	G51200	0.17–0.22	0.70–0.90	0.035	0.040	0.15–0.35	—	0.70–0.90	—	—
5130	G51300	0.28–0.33	0.70–0.90	0.035	0.040	0.15–0.35	—	0.80–1.10	—	—
5132	G51320	0.30–0.35	0.60–0.80	0.035	0.040	0.15–0.35	—	0.75–1.00	—	—
5135	G51350	0.33–0.38	0.60–0.80	0.035	0.040	0.15–0.35	—	0.80–1.05	—	—
5140	G51400	0.38–0.43	0.70–0.90	0.035	0.040	0.15–0.35	—	0.70–0.90	—	—
5147	G51470	0.46–0.51	0.70–0.95	0.035	0.040	0.15–0.35	—	0.85–1.15	—	—
5150	G51500	0.48–0.53	0.70–0.90	0.035	0.040	0.15–0.35	—	0.70–0.90	—	—
5155	G51550	0.51–0.59	0.70–0.90	0.035	0.040	0.15–0.35	—	0.70–0.90	—	—
5160	G51600	0.56–0.64	0.75–1.00	0.035	0.040	0.15–0.35	—	0.70–0.90	—	—
51B60^(c)	G51601	0.56–0.64	0.75–1.00	0.035	0.040	0.15–0.35	—	0.70–0.90	—	—
50100^(b)	G50986	0.98–1.10	0.25–0.45	0.025	0.025	0.15–0.35	—	0.40–0.60	—	—
51100^(b)	G51986	0.98–1.10	0.25–0.45	0.025	0.025	0.15–0.35	—	0.90–1.15	—	—
52100^(b)	G52986	0.98–1.10	0.25–0.45	0.025	0.025	0.15–0.35	—	1.30–1.60	—	—
6118	G61180	0.16–0.21	0.50–0.70	0.035	0.040	0.15–0.35	—	0.50–0.70	—	0.10–0.15
6150	G61500	0.48–0.53	0.70–0.90	0.035	0.040	0.15–0.35	—	0.80–1.10	—	0.15 min
8115	G81150	0.13–0.18	0.70–0.90	0.035	0.040	0.15–0.35	0.20–0.40	0.30–0.50	0.08–0.15	—
81B45^(c)	G81451	0.43–0.48	0.75–1.00	0.035	0.040	0.15–0.35	0.20–0.40	0.35–0.55	0.08–0.15	—
8615	G86150	0.13–0.18	0.70–0.90	0.035	0.040	0.15–0.35	0.40–0.70	0.40–0.60	0.15–0.25	—
8617	G86170	0.15–0.20	0.70–0.90	0.035	0.040	0.15–0.35	0.40–0.70	0.40–0.60	0.15–0.25	—
8620	G86200	0.18–0.23	0.70–0.90	0.035	0.040	0.15–0.35	0.40–0.70	0.40–0.60	0.15–0.25	—
8622	G86220	0.20–0.25	0.70–0.90	0.035	0.040	0.15–0.35	0.40–0.70	0.40–0.60	0.15–0.25	—
8625	G86250	0.23–0.28	0.70–0.90	0.035	0.040	0.15–0.35	0.40–0.70	0.40–0.60	0.15–0.25	—
8627	G86270	0.25–0.30	0.70–0.90	0.035	0.040	0.15–0.35	0.40–0.70	0.40–0.60	0.15–0.25	—
8630	G86300	0.28–0.33	0.70–0.90	0.035	0.040	0.15–0.35	0.40–0.70	0.40–0.60	0.15–0.25	—
8637	G86370	0.35–0.40	0.75–1.00	0.035	0.040	0.15–0.35	0.40–0.70	0.40–0.60	0.15–0.25	—
8640	G86400	0.38–0.43	0.75–1.00	0.035	0.040	0.15–0.35	0.40–0.70	0.40–0.60	0.15–0.25	—
8642	G86420	0.40–0.45	0.75–1.00	0.035	0.040	0.15–0.35	0.40–0.70	0.40–0.60	0.15–0.25	—
8645	G86450	0.43–0.48	0.75–1.00	0.035	0.040	0.15–0.35	0.40–0.70	0.40–0.60	0.15–0.25	—
86B45^(c)	G86451	0.43–0.48	0.75–1.00	0.035	0.040	0.15–0.35	0.40–0.70	0.40–0.60	0.15–0.25	—
8650	G86500	0.48–0.53	0.75–1.00	0.035	0.040	0.15–0.35	0.40–0.70	0.40–0.60	0.15–0.25	—
8655	G86550	0.51–0.59	0.75–1.00	0.035	0.040	0.15–0.35	0.40–0.70	0.40–0.60	0.15–0.25	—
8600	G86600	0.56–0.64	0.75–1.00	0.035	0.040	0.15–0.35	0.40–0.70	0.40–0.60	0.15–0.25	—
8720	G87200	0.18–0.23	0.70–0.90	0.035	0.040	0.15–0.35	0.40–0.70	0.40–0.60	0.20–0.30	—
8740	G87400	0.38–0.43	0.75–1.00	0.035	0.040	0.15–0.35	0.40–0.70	0.40–0.60	0.20–0.30	—
8822	G88220	0.20–0.25	0.75–1.00	0.035	0.040	0.15–0.35	0.40–0.70	0.40–0.60	0.30–0.40	—
9254	G92540	0.51–0.59	0.60–0.80	0.035	0.040	1.20–1.60	—	0.60–0.80	—	—
9260	G92600	0.56–0.64	0.75–1.00	0.035	0.040	1.80–2.20	—	—	—	—
9310^(b)	G93106	0.08–0.13	0.45–0.65	0.025	0.025	0.15–0.35	3.00–3.50	1.00–1.40	0.08–0.15	—
94B15^(c)	G94151	0.13–0.18	0.75–1.00	0.035	0.040	0.15–0.35	0.30–0.60	0.30–0.50	0.08–0.15	—
94B17^(c)	G94171	0.15–0.20	0.75–1.00	0.035	0.040	0.15–0.35	0.30–0.60	0.30–0.50	0.08–0.15	—
94B30^(c)	G94301	0.28–0.33	0.75–1.00	0.035	0.040	0.15–0.35	0.30–0.60	0.30–0.50	0.08–0.15	—

Source: ASM Handbook, Vol 1 (10th ed.), “Classification and Designation of Carbon and Low-Alloy Steels”, Table 19.

Alloy steel composition chart, printable PDF

Three A4 pages with the composition limits of 116 grades, the manganese, molybdenum, chromium and nickel series and the SAE potential standard PS grades, the values flagged in the source notes marked, and our contact details.

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SAE potential standard steels

The PS series, grades proposed as standard and often supplied to a hardenability requirement rather than to a chemistry alone. Table 20 of the source.

SAE PS number	C	Mn	P max	S max	Si	Ni	Cr	Mo	B
PS 10	0.19–0.24	0.95–1.25	0.035	0.040	0.15–0.35	0.20–0.40	0.25–0.40	0.05–0.10	—
PS 15	0.18–0.23	0.90–1.20	0.035	0.040	0.15–0.35	—	0.40–0.60	0.13–0.20	—
PS 16	0.20–0.25	0.90–1.20	0.035	0.040	0.15–0.35	—	0.40–0.60	0.13–0.20	—
PS 17	0.23–0.28	0.90–1.20	0.035	0.040	0.15–0.35	—	0.40–0.60	0.13–0.20	—
PS 18	0.25–0.30	0.90–1.20	0.035	0.040	0.15–0.35	—	0.40–0.60	0.13–0.20	—
PS 19	0.18–0.23	0.90–1.20	0.035	0.040	0.15–0.35	—	0.40–0.60	0.08–0.15	0.0005–0.003
PS 20	0.13–0.18	0.90–1.20	0.035	0.040	0.15–0.35	—	0.40–0.60	0.13–0.20	—
PS 21	0.15–0.20	0.90–1.20	0.035	0.040	0.15–0.35	—	0.40–0.60	0.13–0.20	—
PS 24	0.18–0.23	0.75–1.00	0.035	0.040	0.15–0.35	—	0.45–0.65	0.20–0.30	—
PS 30	0.13–0.18	0.70–0.90	0.035	0.040	0.15–0.35	0.70–1.00	0.45–0.65	0.45–0.60	—
PS 31	0.15–0.20	0.70–0.90	0.035	0.040	0.15–0.35	0.70–1.00	0.45–0.65	0.45–0.60	—
PS 32	0.18–0.23	0.70–0.90	0.035	0.040	0.15–0.35	0.70–1.00	0.45–0.65	0.45–0.60	—
PS 33^(b)	0.17–0.24	0.85–1.25	0.035	0.040	0.15–0.35	0.20 min	0.20 min	0.05 min	—
PS 34	0.28–0.33	0.90–1.20	0.035	0.040	0.15–0.35	—	0.40–0.60	0.13–0.20	—
PS 36	0.38–0.43	0.90–1.20	0.035	0.040	0.15–0.35	—	0.45–0.65	0.13–0.20	—
PS 38	0.43–0.48	0.90–1.20	0.035	0.040	0.15–0.35	—	0.45–0.65	0.13–0.20	—
PS 39	0.48–0.53	0.90–1.20	0.035	0.040	0.15–0.35	—	0.45–0.65	0.13–0.20	—
PS 40	0.51–0.59	0.90–1.20	0.035	0.040	0.15–0.35	—	0.45–0.65	0.13–0.20	—
PS 54	0.19–0.25	0.70–1.05	0.035	0.040	0.15–0.35	—	0.40–0.70	0.05 min	—
PS 55	0.15–0.20	0.70–1.00	0.035	0.040	0.15–0.35	1.65–2.00	0.45–0.65	0.65–0.80	—
PS 56	0.080–0.13	0.70–1.00	0.035	0.040	0.15–0.35	1.65–2.00	0.445–0.65	0.65–0.80	—
PS 57	0.08 max	1.25 max	0.040	0.15–0.35	1.00 max	—	17.00–19.00	1.75–2.25	—
PS 58	0.16–0.21	1.00–1.30	0.035	0.040	0.15–0.35	—	0.45–0.65	—	—
PS 59	0.18–0.23	1.00–1.30	0.035	0.040	0.15–0.35	—	0.70–0.90	—	—
PS 61	0.23–0.28	1.00–1.30	0.035	0.040	0.15–0.35	—	0.70–0.90	—	—
PS 63	0.31–0.38	0.75–1.10	0.035	0.040	0.15–0.35	—	0.45–0.65	—	0.0005–0.003
PS 64	0.16–0.21	1.00–1.30	0.035	0.040	0.15–0.35	—	0.70–0.90	—	—
PS 65	0.21–0.26	1.00–1.30	0.035	0.040	0.15–0.35	—	0.70–0.90	—	—
PS 66^(c)	0.16–0.21	0.40–0.70	0.035	0.040	0.15–0.35	1.65–2.00	0.45–0.75	0.08–0.15	—
PS 67	0.42–0.49	0.80–1.20	0.035	0.040	0.15–0.35	—	0.85–1.20	0.25–0.35	—

Source: ASM Handbook, Vol 1 (10th ed.), “Classification and Designation of Carbon and Low-Alloy Steels”, Table 20.

Alloy steel composition chart, printable PDF

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^(a) Small quantities of certain elements that are not specified or required may be found in alloy steels. These elements are to be considered as incidental and are acceptable to the following maxima. Copper to 0.35%, nickel to 0.25%, chromium to 0.20%, and molybdenum to 0.06%.
^(b) Electric furnace steel, which is why the E4340 row carries lower phosphorus and sulfur than the 4340 row above it.
^(c) Boron content is 0.0005-0.003%. Boron is added to raise hardenability in place of part of the alloy content, and the letter B sits before the last two digits of the grade number.
^(d) Some PS steels may be supplied to a hardenability requirement. PS 34 and PS 38 are supplied to a hardenability requirement of 15 HRC points within the range of 23-43 HRC at J4, and PS 66 carries a vanadium content of 0.10-0.15%.

Table notes

Three values in the source table are printed with a defect. Grade 4118 molybdenum is printed as 0.08-015 and is given here as 0.08-0.15, because a 15 % molybdenum range is not possible and the same chemistry is printed correctly for the 4118-type grades elsewhere in the table. Grades 4023 show a blank molybdenum cell and a blank vanadium cell where every other row carries the not-specified mark, and the row is reproduced as printed. Grade 8600 is printed against the UNS number G86600, which belongs to SAE 8660, and the row is reproduced as printed rather than renumbered. Two further values are reproduced exactly as the source prints them and look unusual. PS 56 carries 0.080-0.13 % C and 0.445-0.65 % Cr, and PS 57 carries 0.15-0.35 % sulfur under a column headed S max.

The values above are ladle or cast analysis limits in weight percent. Product analysis tolerances are wider and are set by the governing standard. Confirm the limits that apply to your order against the material test certificate or with Aobo Steel before releasing a heat.

Composition data is for general reference only. Actual values vary by standard, mill, and heat number. Confirm against the material test certificate (MTC) or contact Aobo Steel. Grade pages for individual steels, such as the 4140 composition, carry the same table values for one grade with its heat treatment and applications.

Why the same grade has two chemistries

The 4340 row above carries 0.035 % phosphorus and 0.040 % sulfur. The E4340 row below it carries 0.025 and 0.025, because the E marks electric furnace steel with a cleaner residual level. Both are correct for the grade number.

Boron saves alloy content

A boron grade reaches the same hardenability with less nickel, chromium and molybdenum. The case hardening steel guide sets out when that trade is worth making on a carburized part.

Chromium and molybdenum do the work

In the 41xx series the chromium carries hardenability and the molybdenum carries temper resistance. The 4140 properties page shows what that combination does to hardness and to heat treatment.

Ask for the certificate with the heat number

Every alloy steel shipment leaves here with an EN 10204 3.1 mill certificate that includes the heat number, so you can check the limits above against the heat that was actually rolled.

Carbon steel composition chart · Tool steel composition chart · Stainless steel composition chart · 4140 steel properties · 4340 steel properties · 8620 steel properties · Case hardening steel guide · SCM415 alloy steel · Steel machinability ratings · H steel composition chart

Source: ASM Handbook, Vol 1 (10th ed.), “Classification and Designation of Carbon and Low-Alloy Steels”, Tables 19 and 20. Values are ladle or cast analysis limits in weight percent.