Steel Grade Family: Carbon, Alloy, Stainless & Tool Steel Grades

Steel Grades in Indian Standard: Equivalent Grade Chart

Buyers often search for steel grades in Indian standard (IS) terms and need the equivalent EN, DIN or AISI / SAE designation. The chart lists the equivalent designations given on each grade page for the grades most often requested; click a grade for composition, mechanical properties and heat treatment. Equivalents are approximate where the grade page says so.

Grade	Carbon (%)	Equivalent designations
EN8 carbon steel	0.35 - 0.45	EN8 (BS 970); AISI 1040 / 1045; IS 1570 GR 40C8
EN9 carbon steel	0.50 - 0.60	EN9 (BS 970); AISI 1050 / 1055; IS 1570 GR 55C8
C45 carbon steel	0.40 - 0.50	EN8 (BS EN standard); C45 / 1.0503 (DIN / EN 10083); AISI 1045 (american standard)
CK45 carbon steel	0.42 - 0.50	EN47 (approximate equivalent); C45 (DIN / EN standard); AISI 1045 (american standard)
EN19 alloy steel	0.35 - 0.45	EN19 (BS EN 10083-1): european standard alloy steel; AISI 4140: american standard similar to EN19; 42CrMo4 : closely related european grade
EN24 alloy steel	0.35 - 0.45	EN24 (BS 970): british standard; AISI 4340: american standard equivalent; 34CrNiMo6: european equivalent
EN31 alloy steel	0.90 - 1.20	EN31 (BS 970): british standard; AISI 52100: american bearing steel; 100Cr6 (EN ISO 683-17): european equivalent
42CrMo4 alloy steel	0.38 - 0.45	42CrMo4 has several international equivalents, including:; EN19 (BS EN 10083-3) – european standard; AISI 4140 – american standard
25CrMo4 alloy steel	0.22 - 0.29	EN 10083 - 25CrMo4; DIN 1.7218; AISI / SAE 4130
SAE 4140 alloy steel	0.38 - 0.43	42CrMo4 (EN 10083-3) - european standard; EN19 (BS standard) - british standard; IS 1570 (part 3) - 4140 type - indian standard
SAE 4340 alloy steel	0.38 - 0.43	EN34NiCrMo6 - European standard; DIN 34NiCrMo6 - German standard; IS 1570 (Part 3) - 34NiCrMo6 type - Indian standard
SAE 8620 alloy steel	0.18 - 0.23	EN353 – case hardening nickel alloy steel; 20NiCrMo2-2 - european carburizing steel; DIN 1.6523 - approximate equivalent
16MnCr5 alloy steel	0.14 - 0.19	EN 10084 - 16MnCr5 (european standard); DIN 1.7131 - german standard; AISI 5115 / AISI 5117 - american standard (approximate)
20MnCr5 alloy steel	0.17 - 0.23	EN 10084 - 20MnCr5 (european standard); DIN 1.7147 - german standard; AISI 5120 - american standard (approximate)
55Si7 spring steel	0.52 - 0.60	EN 10089 - 55Si7; DIN 55Si7; Is 3195 - 55Si7 type
SAE 52100 bearing steel	0.98 - 1.10	EN 100Cr6 - european standard; DIN 100Cr6 - german standard; JIS SUJ2 - japanese standard
AISI D2 tool steel	1.40 - 1.60	DIN 1.2379; JIS SKD11; EN 1.2363
H13 hot work tool steel	0.32 - 0.45	H13 (AISI): american standard; x40CrMOV5-1 (EN ISO 4957): european standard; DIN 1.2344: german standard

Case Hardening Steels List: Grades, Chemical Composition and Material

Case hardening steel grades in India are low carbon steels that are carburized to give a hard case and a tough core. Our case hardening steels list: 15Cr3 alloy steel, 16MnCr5 alloy steel, 20MnCr5 alloy steel, 16MnCrB5 alloy steel, SCM415 alloy steel, SCM420 alloy steel, SAE 8617 alloy steel, SAE 8620 alloy steel, SAE 8622 alloy steel, EN353 alloy steel, 15CrNi6 alloy steel, 16CrNi4 alloy steel, 20CrNi6 alloy steel, SAE 4320 alloy steel. Case hardening steel chemical composition: carbon stays low (0.10 to 0.25 % across these grades) with chromium, manganese, nickel or molybdenum added for hardenability. Case hardening steel material is used for gears, pinions, shafts and bearing parts. All case hardening steel grades are supplied as forging ingots, billets and blooms and rolled bars.

Grade	Carbon (%)	Manganese (%)	Chromium (%)
15Cr3 alloy steel	0.12 - 0.18	0.50 - 0.80	0.70 - 1.00
16MnCr5 alloy steel	0.14 - 0.19	1.00 - 1.30	0.80 - 1.10
20MnCr5 alloy steel	0.17 - 0.23	1.00 - 1.30	1.00 - 1.30
16MnCrB5 alloy steel	0.14 - 0.19	1.00 - 1.30	0.80 - 1.10
SCM415 alloy steel	0.13 - 0.18	0.60 - 0.85	0.90 - 1.20
SCM420 alloy steel	0.18 - 0.23	0.60 - 0.85	0.90 - 1.20
SAE 8617 alloy steel	0.15 - 0.20	0.70 - 0.90	0.40 - 0.60
SAE 8620 alloy steel	0.18 - 0.23	0.70 - 0.90	0.40 - 0.60

Spring Steel Specification and Spring Steel Grades

Spring steel specification is set by high carbon content with silicon, chromium or vanadium for elasticity and fatigue life. Spring steel grades we supply are 55Si7 spring steel, 65Si7 spring steel, SAE 5160 alloy steel, 51CrV4 alloy steel, 50CrV4 alloy steel, EN45 spring steel and the SUP-series. The table gives the spring steel specification ranges from the grade pages.

Grade	Carbon (%)	Silicon (%)	Manganese (%)	Chromium (%)
55Si7 spring steel	0.52 - 0.60	1.50 - 2.00	0.70 - 1.00	-
65Si7 spring steel	0.60 - 0.70	1.50 - 2.00	0.70 - 1.00	-
SAE 5160 alloy steel	0.56 - 0.64	0.15 - 0.35	0.75 - 1.00	0.70 - 0.90
51CrV4 alloy steel	0.47 - 0.55	Max 0.40	0.70 - 1.10	0.90 - 1.20
50CrV4 alloy steel	0.47 - 0.55	Max 0.40	0.70 - 1.10	0.90 - 1.20
EN45 spring steel	0.55 - 0.60	1.50 - 2.00	0.70 - 1.00	Nil

Free Cutting Steel: Composition, Equivalent, Application, Specification and Supplier

Free cutting steel is carbon steel with extra sulphur so it machines quickly with short chips. Kesari Alloys is a free cutting steel supplier with six grades: SAE 1117 carbon steel, SAE 1140 carbon steel, SAE 1141 carbon steel, EN15AM alloy steel, EN1A alloy steel, EN8DM carbon steel. Free cutting steel composition and free cutting steel chemical composition are shown in the table; the free cutting steel equivalent is listed against each grade. Free cutting steel application: automatic lathe parts, bolts, pins, spindles and other machined components, where machinability matters more than toughness. Free cutting steel specification and free cutting steel material details are on each grade page.

Grade	Carbon (%)	Manganese (%)	Sulphur (%)	Equivalent
SAE 1117 carbon steel	0.14 - 0.20	1.00 - 1.30	0.080 - 0.130	EN 1.0715
SAE 1140 carbon steel	0.37 - 0.44	1.35 - 1.65	0.040 - 0.060	EN 1.1165 (C40E) - approximate
SAE 1141 carbon steel	0.39 - 0.47	1.35 - 1.65	0.040 - 0.060	DIN c45Mn (approximate)
EN15AM alloy steel	0.30 - 0.40	1.30 - 1.70	0.020 max	EN15AM (BS 970): british standard
EN1A alloy steel	0.07 - 0.15	0.80 - 1.20	-	EN1A (BS 970): British standard
EN8DM carbon steel	0.40 - 0.45	0.90 - 1.30	0.12 - 0.20	EN8 / EN8DM (BS 970): british standard

Free cutting steel price depends on grade, section and quantity; ask for a quotation on the contact page.

Ball Bearing Steel Composition

Ball bearing steel composition is high carbon, high chromium steel. Our ball bearing steels are SAE 52100 bearing steel, EN31 alloy steel. For SAE 52100 the carbon content is 0.98 - 1.10 % and chromium 1.30 - 1.60 %; the equivalent designations are EN 100Cr6 - european standard; DIN 100Cr6 - german standard.

Boron Steel: Composition, Equivalent, Specification and Manufacturers in India

Boron steel has a small boron addition (about 0.0005 - 0.003 % in the table below) that raises hardenability at low cost. Boron steel manufacturers in India are few; Kesari Alloys makes boron steel in the grades 20MnCrB5 boron alloy steel, 16MnCrB5 alloy steel, SHE 15B4H boron steel, EN15B boron carbon steel, SAE 1541 (B) steel. Boron steel composition and boron steel chemical composition are tabulated; boron steel equivalent and boron steel specification follow the EN and DIN designations on each page. Boron steel application: fasteners, automotive parts, agricultural tools and forged components that need through hardening.

Grade	Carbon (%)	Manganese (%)	Boron (%)	Equivalent
20MnCrB5 boron alloy steel	0.17 - 0.23	1.00 - 1.30	0.0005 - 0.003	EN 20MnCrB5 - European standard
16MnCrB5 alloy steel	0.14 - 0.19	1.00 - 1.30	0.0005 - 0.0030	EN 10084 - 16MnCr5 (boron modified)
SHE 15B4H boron steel	0.12 - 0.18	0.60 - 0.90	0.0005 - 0.003	EN15B4 - European standard
EN15B boron carbon steel	0.30 - 0.40	0.60 - 0.90	0.0005 - 0.003	No direct SAE / AISI equivalent (due to boron addition)
SAE 1541 (B) steel	0.36 - 0.44	1.35 - 1.65	0.0005 - 0.0030	EN boron-modified medium carbon steels - comparable

Carbon Manganese Steel: Composition, Uses and Price

Carbon manganese steel gets its strength from manganese rather than alloy additions. Carbon manganese steel composition: manganese 1.40 - 1.80 % in 27Mn2 with carbon 0.24 - 0.30 %. Our carbon manganese grades are 20Mn2 carbon–manganese steel, 27Mn2 carbon-manganese steel, EN15 carbon steel, 37Mn2 alloy steel, EN15A carbon steel, SAE 1541 steel. Carbon manganese steel uses: shafts, axles, forged engineering parts and automotive components. Carbon manganese steel price follows the market and order size; request a quotation on the contact page.

Grade	Carbon (%)	Manganese (%)	Equivalent
20Mn2 carbon–manganese steel	0.16 - 0.24	1.30 - 1.70	20Mn2(is)
27Mn2 carbon-manganese steel	0.24 - 0.30	1.40 - 1.80	EN 10083 - 27Mn2
EN15 carbon steel	0.30 - 0.40	0.60 - 0.90	DIN C40 (approximate)
37Mn2 alloy steel	0.34 - 0.41	1.40 - 1.80	Is 4432 - 37Mn2 (indian standard)
EN15A carbon steel	0.30 - 0.40	0.60 - 0.90	DIN C40 (approximate)
SAE 1541 steel	0.36 - 0.44	1.35 - 1.65	EN 10083 medium carbon Mn steels - comparable

Steel for Shafts, Axles, Gears and Crankshafts

Best steel for shafts depends on the load. Carbon steel for shafts is usually EN8, EN9 or C45; for heavier duty, alloy grades such as EN19, EN24, 42CrMo4, 4140 and 4340 are used. Our shaft grades: EN8 carbon steel, EN9 carbon steel, C45 carbon steel, EN19 alloy steel, EN24 alloy steel, 42CrMo4 alloy steel, SAE 4140 alloy steel, SAE 4340 alloy steel. Shafts are round bars, so standard steel shaft sizes follow the rolled round bar sizes of 16 to 180 mm (steel shaft sizes) on the rolled bars page; larger shafts are forged from forging ingots.

Crankshaft steel and crankshaft steel grade: medium carbon alloy steels such as 42CrMo4 and EN19/EN24 are the usual crankshaft steel type; the crankshaft chemical composition is the grade composition on the grade page. Axle steel and axle steel grade: EN8, EN9 and C45 are the common choices. Gear steel and gear steel material: case hardening grades such as 16MnCr5, 20MnCr5 and 8620 for gears, with gear material specification on each page. Gear shaft manufacturers in India buy bars and billets from us as steel for shafts.

Forging Steel Process: Heavy Engineering and Pressure Vessel Forging Steel

The forging manufacturing process starts with the right forging steel. In the forging steel process, forging ingots, billets or rolled bars are heated, hot worked on a press or hammer, then normalized or heat treated. Steel for shafts forging, steel for crankshaft forging and gear blank forging steel are usually medium carbon or alloy grades; heavy engineering forging steel is supplied as large forging ingots; pressure vessel forging steel is supplied in ASTM A182 grades such as F22, F11, F9 and F5. We supply ingots, billets and bars for each of these routes.

Steel Grade FAQs

How many steel grades does Kesari Alloys supply?

More than 120 grades across plain carbon, carbon manganese, case hardening, through hardened, spring, bearing, free cutting, boron, tool and stainless steel. Every grade has its own page.

How do I find the equivalent of an EN, SAE or AISI grade?

Use the equivalent grade chart above or open the grade page; the "Equivalent Steel Grades" section lists the Indian, EN, DIN and AISI / SAE designations.

In what forms is steel supplied?

As forging ingots, continuous cast billets and blooms, and hot rolled round, square and flat bars.