STANDARD ALLOY STEELS

Ladle Chemical Ranges and Limits

Bars, Blooms, Billets and Slabs

	Chemical Composition Ranges and Limits, percent
AISI Number	C	Mn	P Max.	S Max.	Si	Ni	Cr	Mo
4130	0.28/0.33	0.40/0.60	0.035	0.040	0.20/0.35	---	0.80/1.10	0.15/0.25
4137	0.35/0.40	0.70/0.90	0.035	0.040	0.20/0.35	---	0.80/1.10	0.15/0.25
4140	0.38/0.43	0.75/1.00	0.035	0.040	0.20/0.35	---	0.80/1.10	0.15/0.25
4142	0.40/0.45	0.75/1.00	0.035	0.040	0.20/0.35	---	0.80/1.10	0.15/0.25
4145	0.43/0.48	0.75/1.00	0.035	0.040	0.20/0.35	---	0.80/1.10	0.15/0.25
4147	0.45/0.50	0.75/1.00	0.035	0.040	0.20/0.35	---	0.80/1.10	0.15/0.25
4150	0.48/0.53	0.75/1.00	0.035	0.040	0.20/0.35	---	0.80/1.10	0.15/0.25
4161	0.56/0.64	0.75/1.00	0.035	0.040	0.20/0.35	---	0.70/0.90	0.25/0.35
4320	0.17/0.22	0.45/0.65	0.035	0.040	0.20/0.35	1.65/2.00	0.40/0.60	0.20/0.30
4340	0.38/0.43	0.60/0.80	0.035	0.040	0.20/0.35	1.65/2.00	0.70/0.90	0.20/0.30
4419	0.18/0.23	0.45/0.65	0.035	0.040	0.20/0.35	---	---	0.45/0.60
4615	0.13/0.18	0.45/0.65	0.035	0.040	0.20/0.35	1.65/2.00	---	0.20/0.30
4620	0.17/0.22	0.45/0.65	0.035	0.040	0.20/0.35	1.65/2.00	---	0.20/0.30
4621	0.18/0.23	0.70/0.90	0.035	0.040	0.20/0.35	1.65/2.00	---	0.20/0.30
4626	0.24/0.29	0.45/0.65	0.035	0.040	0.20/0.35	0.70/1.00	---	0.15/0.25
4718	0.16/0.21	0.70/0.90	0.035	0.040	0.20/0.35	0.90/1.20	0.35/0.55	0.30/0.40
4720	0.17/0.22	0.50/0.70	0.035	0.040	0.20/0.35	0.90/1.20	0.35/0.55	0.15/0.25
4815	0.13/0.18	0.40/0.60	0.035	0.040	0.20/0.35	3.25/3.75	---	0.20/0.30
4817	0.15/0.20	0.40/0.60	0.035	0.040	0.20/0.35	3.25/3.75	---	0.20/0.30
4820	0.18/0.23	0.50/0.70	0.035	0.040	0.20/0.35	3.25/3.75	---	0.20/0.30
5120	0.17/0.22	0.70/0.90	0.035	0.040	0.20/0.35	---	0.70/0.90	---
5130	0.28/0.33	0.70/0.90	0.035	0.040	0.20/0.35	---	0.80/1.10	---
5132	0.30/0.35	0.60/0.80	0.035	0.040	0.20/0.35	---	0.75/1.00	---
5135	0.33/0.38	0.60/0.80	0.035	0.040	0.20/0.35	---	0.80/1.05	---
5140	0.38/0.43	0.70/0.90	0.035	0.040	0.20/0.35	---	0.70/0.90	---
5145	0.43/0.48	0.70/0.90	0.035	0.040	0.20/0.35	---	0.70/0.90	---
5147	0.46/0.51	0.70/0.95	0.035	0.040	0.20/0.35	---	0.85/1.15	---
5150	0.48/0.53	0.70/0.90	0.035	0.040	0.20/0.35	---	0.70/0.90	---
5155	0.51/0.59	0.70/0.90	0.035	0.040	0.20/0.35	---	0.70/0.90	---
6150	0.48/0.53	0.70/0.90	0.035	0.040	0.20/0.35	---	0.80/1.10	0.15 min.
8615	0.13/0.18	0.70/0.90	0.035	0.040	0.20/0.35	0.40/0.70	0.40/0.60	0.15/0.25
8617	0.15/0.20	0.70/0.90	0.035	0.040	0.20/0.35	0.40/0.70	0.40/0.60	0.15/0.25
8620	0.18/0.23	0.70/0.90	0.035	0.040	0.20/0.35	0.40/0.70	0.40/0.60	0.15/0.25
8622	0.20/0.25	0.70/0.90	0.035	0.040	0.20/0.35	0.40/0.70	0.40/0.60	0.15/0.25
8625	0.23/0.28	0.70/0.90	0.035	0.040	0.20/0.35	0.40/0.70	0.40/0.60	0.15/0.25
8627	0.25/0.30	0.70/0.90	0.035	0.040	0.20/0.35	0.40/0.70	0.40/0.60	0.15/0.25
8630	0.28/0.33	0.70/0.90	0.035	0.040	0.20/0.35	0.40/0.70	0.40/0.60	0.15/0.25
8637	0.35/0.40	0.75/1.00	0.035	0.040	0.20/0.35	0.40/0.70	0.40/0.60	0.15/0.25
8640	0.38/0.43	0.75/1.00	0.035	0.040	0.20/0.35	0.40/0.70	0.40/0.60	0.15/0.25
8642	0.40/0.45	0.75/1.00	0.035	0.040	0.20/0.35	0.40/0.70	0.40/0.60	0.15/0.25
8645	0.43/0.48	0.75/1.00	0.035	0.040	0.20/0.35	0.40/0.70	0.40/0.60	0.15/0.25
8655	0.51/0.59	0.75/1.00	0.035	0.040	0.20/0.35	0.40/0.70	0.40/0.60	0.15/0.25
8720	0.18/0.23	0.70/0.90	0.035	0.040	0.20/0.35	0.40/0.70	0.40/0.60	0.20/0.30
8740	0.38/0.43	0.75/1.00	0.035	0.040	0.20/0.35	0.40/0.70	0.40/0.60	0.20/0.30
8822	0.20/0.25	0.75/1.00	0.035	0.040	0.20/0.35	0.40/0.70	0.40/0.60	0.30/0.40
9254	0.51/0.59	0.60/0.80	0.035	0.040	1.20/1.60	0.60/0.80	---	---
9255	0.51/0.59	0.70/0.95	0.035	0.040	1.80/2.20	---	---	---
9260	0.56/0.64	0.75/1.00	0.035	0.040	1.80/2.20	---	---	---

NOTE 1. Grades shown in the above list with prefix letter E are normally made only by the basic electric furnace process. All others are normally manufactured by the basic open hearth or basic oxygen processes but may be manufactured by the basic electric furnace process with adjustments in phosphorus and sulphur.

NOTE 2. The phosphorus and sulphur limitations for each process are as follows:

	Maximum / percent
	P	S
Basic electric	0.025	0.025
Basic open hearth    or basic oxygen	0.035	0.040
Acid electric	0.050	0.050
Acid open hearth	0.050	0.050

NOTE 3. Minimum silicon limit for acid open hearth or acid electric furnace alloy steel is 0.15 percent.

NOTE 4. Small quantities of certain elements are present in alloy steels which are not specified or required. These elements are considered as incidental and may be present to the following maximum amounts: Copper, 0.35 percent; Nickel, 0.25 percent; Chromium, 0.20 percent and Molybdenum, 0.06 percent.

NOTE 5. Where minimum and maximum sulphur content is shown it is indicative of resulphurized steel.

NOTE 6. The chemical ranges and limits shown above are produced to check analysis tolerances shown in the AISI manual.

NOTE 7. Standard alloy steels can be produced with a lead range of 0.15/0.35 percent. Lead is reported only as a range since it is added to the ladle stream as the steel is being poured.