30G2 EN 28Mn6 / 1.1170

Grade family: Manganese steel for quenching and tempering
Governing standards: EN 10083-2, EN 10250-2, PN-H-84030
Delivery condition: +N, +QT, +A
Product forms: Bars, rings, discs, blocks, sleeves, shafts
Certification: EN 10204 3.1 (3.2 on request)
Manufactured in: Jiangyin, Jiangsu, China

30G2 Forged Bars, Rings, Discs and Shafts

Q: What is 30G2 steel equivalent to?

30G2 is closely equivalent to EN 28Mn6 (material number 1.1170), Chinese GB 30Mn2, US SAE/AISI 1330 (UNS G13300), Japanese JIS SMn433, Czech ČSN 13141 and French AFNOR 20M5. British BS 970 150M28 is a near equivalent. Cross-reference tables indicate the closest known grades only, so confirm the governing specification before substituting.

Q: Is 30G2 the same as 28Mn6?

30G2 and 28Mn6 are different designations for what is treated as the same grade. 30G2 comes from the Polish PN and Russian GOST systems; 28Mn6 / 1.1170 is the European EN 10083-2 designation. Both are manganese steels for quenching and tempering with about 0.28 % carbon and 1.30-1.65 % manganese, so the same forging, heat treatment and testing practice applies to both.

Q: What is the chemical composition of 30G2 steel?

30G2 steel contains 0.25-0.32 % carbon, max 0.40 % silicon, 1.30-1.65 % manganese, max 0.030 % phosphorus, max 0.035 % sulphur, max 0.40 % chromium, max 0.10 % molybdenum and max 0.40 % nickel, with Cr + Mo + Ni limited to 0.63 %. Jiangyin Jiangnan Metal reports the actual heat analysis on the EN 10204 3.1 certificate.

Q: What is the tensile strength of 30G2 steel?

Normalized (+N), 30G2 reaches a minimum tensile strength of 630 MPa up to 16 mm, 600 MPa from 16 to 100 mm, 570 MPa from 100 to 250 mm and 540 MPa from 250 to 1000 mm, with yield strength from 345 MPa down to 260 MPa. Quenched and tempered, the equivalent grade 28Mn6 typically reaches 800-950 MPa in sections up to 16 mm.

Q: What is the forging temperature for 30G2 steel?

30G2 is forged from 1100 °C down to a finishing temperature of about 850 °C. Because the grade is sensitive to overheating and grain coarsening, the soak temperature is held rather than exceeded and the finish temperature is not undercut. Forgings are cooled slowly in air or sand and then normalized at 850-890 °C to refine the grain.

Q: Can 30G2 steel be welded?

30G2 has limited weldability because of its manganese content, but it can be welded with care by arc or MAG processes. Preheat to roughly 200-300 °C, use low-hydrogen consumables, control the interpass temperature and stress relieve after welding at about 650 °C. Flame and plasma cutting need the same preheat and slow cooling in air.

Q: What is the difference between 30G2 and 42CrMo4?

30G2 is a manganese steel with about 0.28 % carbon and no deliberate chromium or molybdenum addition, so it has lower hardenability and is normally used up to about 100 mm after quenching and tempering. 42CrMo4 contains around 1 % chromium and 0.22 % molybdenum, which gives deeper hardening, higher strength and better temper resistance in heavy sections. 30G2 is the lower-cost choice where strength requirements are moderate.

Q: What sizes of 30G2 forgings can be supplied?

Jiangyin Jiangnan Metal open-die forges 30G2 as round bars from 80 to 1200 mm diameter, forged and seamless rolled rings from 200 to 3500 mm outside diameter, discs to 2500 mm diameter, blocks from 50 to 800 mm thickness, hollow bars and sleeves from 150 to 1500 mm outside diameter, and shafts to 8000 mm long, with a single-piece weight from 20 kg to about 20 tonnes. Sizes outside these ranges are reviewed on request.

Q: Do 30G2 forgings come with an EN 10204 3.1 certificate?

Yes. Every 30G2 forging is shipped with an EN 10204 3.1 inspection certificate covering heat analysis, heat-treatment record, mechanical test results and a dimensional report. EN 10204 3.2 certification counter-signed by a third party such as TÜV, SGS, BV or Lloyd's Register is available when specified on the order.

Q: Who supplies 30G2 open-die forgings in China?

Jiangyin Jiangnan Metal Co., Ltd. is an open-die forging factory at No.1 Chengxiqiao Road, Zhouzhuang Town, Jiangyin City, Jiangsu Province, China, manufacturing 30G2 forgings to drawing, including bars, rings, discs, blocks, sleeves and shafts. Send drawings or a size list to sales@steelforgepieces.com or call +86-189-2135-9659.

Chemical composition, mechanical properties, heat treatment and forging practice for 30G2, with the sizes and certification we supply from Jiangyin, China.

30G2 is a manganese steel for quenching and tempering. It carries 0.25–0.32 % carbon and 1.30–1.65 % manganese. The same grade is written 30G2 in the Polish PN and Russian GOST systems, 28Mn6 (1.1170) in EN 10083-2, 30Mn2 in GB and 1330 in the SAE system. Normalized, it gives 630 MPa tensile strength in sections to 16 mm. Quenched and tempered, it reaches 800–950 MPa in the same section.

Jiangyin Jiangnan Metal Co., Ltd. forges 30G2 to drawing at No.1 Chengxiqiao Road, Zhouzhuang Town, Jiangyin City, Jiangsu Province, China. Piece weight runs from 20 kg to about 20 tonnes. Every forging leaves the works with an EN 10204 3.1 certificate.

30G2 at a glance

Carbon content0.25 – 0.32 %
Manganese content1.30 – 1.65 %
Tensile strength (+N, ≤16 mm)630 MPa min.
Yield strength (+N, ≤16 mm)345 MPa min.
Impact energy KV (+QT, +20 °C)40 J
Forging range1100 → 850 °C
Hardening830 – 870 °C, water or oil
Tempering540 – 680 °C, air
Max. hardness soft annealed (+A)223 HBW
Density7.83 g/cm³
WeldabilityLimited, preheat 200–300 °C
Single-piece weight forged20 kg – 20 t

What is 30G2 steel?

30G2 is a manganese structural steel used after normalizing or after quenching and tempering. Manganese at 1.30–1.65 % raises hardenability and strength above a plain carbon steel of the same carbon level. That lets 30G2 cover work which would otherwise call for a molybdenum grade, as long as the section is not too heavy.

The grade holds up under reversing bending and torsion, which is why it appears in axles, connecting rods and stirrer shafts. Hardenability is the limit. Water quenching develops full properties to about 40 mm, oil quenching to about 25 mm. Beyond that the core falls back towards normalized values, so heavy 30G2 forgings are normally ordered in the +N condition.

Manganese also brings two things to watch. 30G2 coarsens if it is soaked too hot, and it is subject to temper brittleness if it cools slowly through the range below the tempering temperature. Both are controlled at the furnace rather than by changing grade.

We forge 30G2 on the same presses as 42CrMo4 and AISI 4140, and will quote a job in whichever of the three suits the section.

30G2 equivalent grades

30G2 carries a different designation in nearly every national standard, and that is where most ordering mistakes start. The table below lists what the grade is called elsewhere.

International equivalent grades for 30G2 steel
Country / standard	Designation	Number	Closeness
Poland (PN)	30G2	PN-H-84030	Reference grade
Russia (GOST)	30G2 / 30Г2	—	Reference grade
Europe (EN)	28Mn6	1.1170	Equivalent
Germany (DIN)	28Mn6	1.1170	Equivalent
China (GB)	30Mn2	—	Equivalent
USA (SAE / AISI)	1330	UNS G13300	Equivalent
Japan (JIS)	SMn433	—	Equivalent
ISO	28Mn6	—	Equivalent
Czech Republic (ČSN)	13141	—	Equivalent
France (AFNOR)	20M5	—	Equivalent
United Kingdom (BS 970)	150M28	—	Near equivalent

Cross-reference tables give the closest known grade, not a guarantee of interchangeability. National standards differ on permitted residuals, testing thickness and delivery condition. Check the governing specification with your design authority before substituting.

Chemical composition of 30G2 steel

Limits in weight per cent. Carbon and manganese carry the properties; the rest is controlled as residual.

30G2 / 28Mn6 chemical composition, weight per cent
C	Si	Mn	P	S	Cr	Mo	Ni	Cr + Mo + Ni
0.25 – 0.32	max 0.40	1.30 – 1.65	max 0.030	max 0.035	max 0.40	max 0.10	max 0.40	max 0.63

We normally work to P ≤ 0.025 % and S ≤ 0.035 %. The ladle and product analysis of each heat is printed on the EN 10204 3.1 certificate that travels with the forging. Tighter residual limits, calcium treatment or vacuum degassing can be written into the order.

Mechanical properties of 30G2 steel

Normalized condition (+N)

Minimum values at room temperature. Properties drop as the ruling section grows, since the core cools more slowly.

30G2 mechanical properties in the normalized condition
Property	to 16 mm	16 – 100 mm	100 – 250 mm	250 – 500 mm	500 – 1000 mm
Tensile strength R_m, MPa	630	600	570	540	540
Yield strength R_e / R_p0.2, MPa	345	310	290	270	260
Elongation A, L₀ = 5.65 √S₀, %	17	18	18	—	—

Impact energy KV in the quenched and tempered condition is 40 J at +20 °C.

Quenched and tempered condition (+QT)

Figures for the European equivalent 28Mn6 (1.1170) to EN 10083-2, given for guidance. Confirm the standard revision and the ruling section with your inspection body before ordering against them.

28Mn6 mechanical properties in the quenched and tempered condition
Diameter d	R_e min, MPa	R_m, MPa	A min, %	Z min, %	KV min, J
d ≤ 16 mm	590	800 – 950	13	40	—
16 < d ≤ 40 mm	490	700 – 850	15	45	40
40 < d ≤ 100 mm	440	650 – 800	16	50	40

Hardness in the delivery condition

30G2 delivery hardness
Delivery condition	Brinell hardness, HBW
+S, treated for cold shearability	max 255
+A, soft annealed	max 223

Physical properties

30G2 physical properties at room temperature
Property	Value
Density	7.83 g/cm³
Modulus of elasticity	210 GPa
Poisson's ratio	0.30

30G2 heat treatment and hot working

Where each operation sits on the temperature scale:

Forging / hot working 1100 → 850 °C

Normalizing 850 – 890 °C, air

Hardening 830 – 870 °C, water/oil

Soft annealing 650 – 700 °C, furnace

Tempering 540 – 680 °C, air

Stress relieving approx. 650 °C, 1–2 h

30G2 / 28Mn6 heat treatment parameters
Operation	Temperature	Cooling	Notes
Forging / hot rolling	1100 – 850 °C	Still air or sand	Do not overheat; finish above 850 °C
Normalizing	850 – 890 °C	Air	Soak at least 30 min; refines forged grain
Soft annealing	650 – 700 °C	Furnace	Gives max 223 HBW for machining
Hardening	830 – 870 °C	Water or oil	Lower end for water, upper end for oil
Tempering	540 – 680 °C	Air	Hold at least 1 h; avoid slow cooling through the temper-brittle range
Stress relieving	approx. 650 °C	Air	1 – 2 h; reduces distortion before final machining

Best through-hardening comes in sections to about 40 mm in water and about 25 mm in oil. Above that the core approaches normalized properties, which is why heavy 30G2 forgings are usually ordered +N.

How 30G2 is open-die forged

Our route from billet to a certified 30G2 forging:

Raw material. Electric-arc furnace steel refined by ladle furnace, with vacuum degassing when the order calls for reduced hydrogen and tighter inclusion cleanliness.
Heating. The billet is soaked to 1100 °C in a controlled furnace. 30G2 is sensitive to overheating, so the soak temperature is held rather than exceeded to avoid coarse austenite grain.
Open-die forging. Upsetting and drawing on a hydraulic press with a total forging ratio of at least 3:1, and 4:1 or higher for shafts and rings where directional properties matter. Forging finishes at or above 850 °C.
Post-forge cooling. Slow cooling in still air or covered in sand. Heavy sections may go straight into a furnace for controlled cooling to avoid flakes.
Heat treatment. Normalizing at 850–890 °C to refine the as-forged structure, followed by quenching and tempering when +QT properties are specified.
Rough machining. Turning or boring to the customer's machining allowance so that test pieces come from a representative location.
Testing and certification. Chemical analysis, mechanical testing, ultrasonic examination and dimensional inspection, released against EN 10204 3.1.

30G2 forged product forms and sizes

All of it is forged to order against a drawing or a size list, in 30G2 and in the equivalent grades 28Mn6, 1.1170, 30Mn2, SAE 1330 and SMn433.

30G2 open-die forged product forms and size ranges
Product form	Size range	Typical use
Forged round bars, square bars, flat bars, hex bars	Ø 80 – 1200 mm · length to 8000 mm	Shaft blanks, machining stock, pins
Forged hollow bars, sleeves, bushes, cylinders, casings, shells	OD 150 – 1500 mm · ID from 80 mm	Hydraulic cylinders, bushings, housings
Seamless rolled rings	OD 200 – 3500 mm · height to 800 mm	Bearing races, gear rims, flange rings
Forged rings and flanges	OD 200 – 2500 mm	Pressure and structural connections
Forged blocks, discs, plates	Thickness 50 – 800 mm · width to 1500 mm · discs to Ø 2500 mm	Die blocks, tube sheets, end covers
Forged gear shafts, pinion shafts, spindles, step shafts	Ø 80 – 800 mm · length to 8000 mm	Gearboxes, rolling mills, marine drives
Single-piece weight	20 kg – 20 000 kg	—

Supply condition: as-forged, +N, +NT, +QT or +A. Surface: black forged, shot-blasted, rough turned or proof machined. Machining allowance is agreed at enquiry and repeated on the order acknowledgement.

Testing, inspection and certification

Standard test scope on a 30G2 order. Anything extra can be added at enquiry stage.

Standard test scope for 30G2 forgings
Test	Method / standard	Scope
Chemical analysis	Optical emission spectrometry; PMI on request	Ladle and product analysis
Tensile test	EN ISO 6892-1	Per heat and heat-treatment batch
Impact test	EN ISO 148-1, Charpy V-notch	Set of 3 at specified temperature
Hardness	EN ISO 6506-1, Brinell	Per piece or per batch
Ultrasonic examination	EN 10228-3 or ASTM A388	Acceptance class to order
Magnetic particle examination	EN 10228-1 or ASTM A275	On request
Grain size	ASTM E112	On request
Dimensional inspection	Report against customer drawing	Every piece
Material certificate	EN 10204 3.1 standard; 3.2 on request	Every shipment

Third-party witness inspection by TÜV, SGS, BV, DNV or Lloyd's Register is arranged at your cost when it is called out on the purchase order.

Applications of 30G2 forgings

30G2 and its equivalents go into heavily worked structural parts that have to carry reversing bending and torsion after heat treatment:

Axles, shafts, cardan shafts, camshafts and crankshafts
Gear wheels, gear rims and pinion shafts in general engineering gearboxes
Connecting rods, levers, forks and shanks
Wheels, rollers, drums and stirrer shafts
High-pressure cylinders, rotors and structural machine parts
Larger fasteners and studs where moderate strength is sufficient

Notch toughness at and slightly below ambient temperature is good, so the grade also turns up in weld-fabricated pressure parts where the design temperature does not call for a low-temperature steel.

Machining and welding 30G2

Machining

30G2 machines well in the normalized or soft-annealed condition, where hardness stays at or below 223 HBW. On long shafts and thin discs, rough machine first, stress relieve at about 650 °C, then finish. That keeps distortion down.

Welding and thermal cutting

Weldability is limited by the manganese level. Preheat to 200–300 °C, use low-hydrogen consumables with arc or MAG, hold the interpass temperature, and stress relieve at about 650 °C afterwards. Oxy-fuel and plasma cutting need the same preheat and cooling in still air.

Long soaks decarburize the surface. Either run a controlled atmosphere or leave enough machining allowance to cut the decarburized layer away.

30G2 compared with other forging grades

Comparison of 30G2 with 42CrMo4 and AISI 4140
Criterion	30G2 / 28Mn6	42CrMo4 / AISI 4140	34CrNiMo6
Main alloying	1.5 % Mn	1 % Cr, 0.22 % Mo	1.5 % Cr, 1.5 % Ni, 0.2 % Mo
Hardenability	Low, best to about 40 mm	Medium-high	High, suits heavy sections
Typical R_m (+QT)	650 – 950 MPa	900 – 1100 MPa	1000 – 1200 MPa
Relative cost	Lowest	Medium	Highest
Best suited to	Moderately loaded parts, thin to medium sections	Heavily loaded shafts and gears	Large, heavily loaded forgings
Datasheet	This page	42CrMo4 · AISI 4140	34CrNiMo6

Frequently asked questions about 30G2

What is 30G2 steel equivalent to?

30G2 is closely equivalent to EN 28Mn6 (material number 1.1170), Chinese GB 30Mn2, US SAE/AISI 1330 (UNS G13300), Japanese JIS SMn433, Czech ČSN 13141 and French AFNOR 20M5. British BS 970 150M28 is a near equivalent. Cross-reference tables indicate the closest known grades only, so confirm the governing specification before substituting.

Is 30G2 the same as 28Mn6?

30G2 and 28Mn6 are different designations for what is treated as the same grade. 30G2 comes from the Polish PN and Russian GOST systems; 28Mn6 / 1.1170 is the European EN 10083-2 designation. Both are manganese steels for quenching and tempering with about 0.28 % carbon and 1.30–1.65 % manganese, so the same forging, heat treatment and testing practice applies to both.

What is the chemical composition of 30G2 steel?

30G2 steel contains 0.25–0.32 % carbon, max 0.40 % silicon, 1.30–1.65 % manganese, max 0.030 % phosphorus, max 0.035 % sulphur, max 0.40 % chromium, max 0.10 % molybdenum and max 0.40 % nickel, with Cr + Mo + Ni limited to 0.63 %. Jiangyin Jiangnan Metal reports the actual heat analysis on the EN 10204 3.1 certificate.

What is the tensile strength of 30G2 steel?

Normalized (+N), 30G2 reaches a minimum tensile strength of 630 MPa up to 16 mm, 600 MPa from 16 to 100 mm, 570 MPa from 100 to 250 mm and 540 MPa from 250 to 1000 mm, with yield strength from 345 MPa down to 260 MPa. Quenched and tempered, the equivalent grade 28Mn6 typically reaches 800–950 MPa in sections up to 16 mm.

What is the forging temperature for 30G2 steel?

30G2 is forged from 1100 °C down to a finishing temperature of about 850 °C. Because the grade is sensitive to overheating and grain coarsening, the soak temperature is held rather than exceeded and the finish temperature is not undercut. Forgings are cooled slowly in air or sand and then normalized at 850–890 °C to refine the grain.

Can 30G2 steel be welded?

30G2 has limited weldability because of its manganese content, but it can be welded with care by arc or MAG processes. Preheat to roughly 200–300 °C, use low-hydrogen consumables, control the interpass temperature and stress relieve after welding at about 650 °C. Flame and plasma cutting need the same preheat and slow cooling in air.

What is the difference between 30G2 and 42CrMo4?

30G2 is a manganese steel with about 0.28 % carbon and no deliberate chromium or molybdenum addition, so it has lower hardenability and is normally used up to about 100 mm after quenching and tempering. 42CrMo4 contains around 1 % chromium and 0.22 % molybdenum, which gives deeper hardening, higher strength and better temper resistance in heavy sections. 30G2 is the lower-cost choice where strength requirements are moderate.

What sizes of 30G2 forgings can be supplied?

Jiangyin Jiangnan Metal open-die forges 30G2 as round bars from 80 to 1200 mm diameter, forged and seamless rolled rings from 200 to 3500 mm outside diameter, discs to 2500 mm diameter, blocks from 50 to 800 mm thickness, hollow bars and sleeves from 150 to 1500 mm outside diameter, and shafts to 8000 mm long, with a single-piece weight from 20 kg to about 20 tonnes. Sizes outside these ranges are reviewed on request.

Do 30G2 forgings come with an EN 10204 3.1 certificate?

Yes. Every 30G2 forging is shipped with an EN 10204 3.1 inspection certificate covering heat analysis, heat-treatment record, mechanical test results and a dimensional report. EN 10204 3.2 certification counter-signed by a third party such as TÜV, SGS, BV or Lloyd's Register is available when specified on the order.

Who supplies 30G2 open-die forgings in China?

Jiangyin Jiangnan Metal Co., Ltd. is an open-die forging factory at No.1 Chengxiqiao Road, Zhouzhuang Town, Jiangyin City, Jiangsu Province, China, manufacturing 30G2 forgings to drawing, including bars, rings, discs, blocks, sleeves and shafts. Send drawings or a size list to sales@steelforgepieces.com or call +86-189-2135-9659.

About the manufacturer

Jiangyin Jiangnan Metal Co., Ltd. is an open-die forging factory in Jiangyin, Jiangsu Province, on the south bank of the Yangtze between Shanghai and Nanjing. The works makes forged bars, seamless rolled rings, discs, blocks, sleeves, hollow bars and shafts in carbon steel, alloy steel, tool steel, stainless steel and nickel alloys, all to customer drawing. Parts go into gearboxes, hydraulic equipment, marine drives, power generation, petrochemical plant and general machinery.

Jiangyin Jiangnan Metal Co., Ltd.
No.1 Chengxiqiao Road, Zhouzhuang Town, Jiangyin City, Jiangsu Province, China
Telephone: +86-189-2135-9659
Email: sales@steelforgepieces.com
Web: www.steelforgepieces.com

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Standards and data basis

Composition, mechanical and heat-treatment data on this page follow EN 10083-2 (steels for quenching and tempering), EN 10250-2 (open-die steel forgings for general engineering purposes), PN-H-84030 and published mill data for the equivalent grade 28Mn6 / 1.1170. The figures are limit or minimum values. What a given forging actually returns depends on its ruling section, forging ratio and heat-treatment route, and is recorded on the EN 10204 3.1 certificate for that heat.

Reference for this datasheet

Jiangyin Jiangnan Metal Co., Ltd. (2026). 30G2 Steel Forgings (28Mn6 / 1.1170): Composition, Properties and Supply. https://www.steelforgepieces.com/Alloy-Steel/30G2.html

Last reviewed by our technical department on 10 September 2026. If you spot an error, or need data that is not here, write to sales@steelforgepieces.com.