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30KHGSN2A (30ХГСН2А) Alloy Steel – High Strength for Critical Parts

Overview of 30KHGSN2A

30KHGSN2A (Russian: 30ХГСН2А, sometimes written 30HGSN2A) is a nickel-bearing Cr-Mn-Si alloy steel engineered for very high strength, hardenability, and fatigue resistance after heat treatment. Compared with 30HGSA, the added Ni (~1.4–1.8%) boosts toughness and plasticity, making it a go-to grade for aerospace shafts, engine components, fasteners, gears, and highly loaded machine parts up to ~100 mm section thickness. At Russian Metals, we stock and process bars, plates, sheets, tubes, and forgings in 30KHGSN2A—precision-cut, tested, and shipped fast across India and worldwide.

      

Grade :	30KHGSN2А ( 30ХГСН2А ) ( 30ХГСНА )
Classification :	Alloy structurall steel

Chemical composition in % for grade 30KHGSА ( 30ХГСА )

C	Si	Mn	Ni	S	P	Cr	Cu
0.28 - 0.34	0.9 - 1.2	0.8 - 1.1	max 0.3	max 0.025	max 0.025	0.8 - 1.1	max 0.3

Temperature of critical points for grade 30KHGSА ( 30ХГСА ).

Ac1 = 760 , Ac3(Acm) = 830 , Ar3(Arcm) = 705 , Ar1 = 670 , Mn = 352

Chemical Composition (Typical Range, %)

30KHGSN2A

Element	C	Mn	Si	Cr	Ni	P (max)	S (max)	Mo (max)	V (max)	Cu (max)
30KHGSN2A	0.27–0.34	1.0–1.3	0.9–1.2	0.9–1.2	1.4–1.8	0.030	0.025	0.11	0.05	0.30

Notes:

• Vacuum-degassed (VD) and low-S/P “-Sh” variants are available for enhanced cleanliness and toughness (e.g., 30HGSN2A-VD, 30HGSN2A-Sh).

Mechanical properties under Т=20°С f°r grade 30KHGSА ( 30ХГСА )

Assortment	Dimension	Direct.	σB	σT	δ5	ψ	KCU	Heat treatment
-	(mm)	-	MPa	MPa	%	%	kJ/m²	-
Pipe, GOST 8731-87			686		11
Pipe cooling strain, GOST 8733-74			491		18
Bar, GOST 4543-71	Ø 25		1080	830	10	45	490	Guenching 880oC, oil, Drawing 540oC, water,
Sheet trick, GOST 11269-76			490-740		20			Normalizing
Sheet trick, GOST 11269-76			1080		9		490	Guenching and drawing
Sheet thin, GOST 11268-76			490-740		20			Normalizing
Sheet thin, GOST 11268-76			1080		10			Guenching and drawing

Brinell hardness for 30KHGSА ( 30ХГСА ) (annealing) , GOST 4543-71	HB 10 -1 = 229 MPa
Brinell hardness for 30KHGSА ( 30ХГСА ) , Pipe GOST 8733-74	HB 10 -1 = 229 MPa
Brinell hardness for 30KHGSА ( 30ХГСА ) , Bar GOST 10702-78	HB 10 -1 = 217 MPa
Brinell hardness for 30KHGSА ( 30ХГСА ) (normalize) , Sheet trick GOST 11269-76	HB 10 -1 = 156 - 217 MPa

Technological properties for grade 30KHGSА ( 30ХГСА )

Weldability :	limited weldability.
Flakes :	predisposed
Temper brittleness:	predisposed

Applications of 30KHGSN2A

Aerospace & Defense:

Engine shafts, compressor blades, pins, levers, fasteners operating to ~200 °C.

Powertrain & Heavy Machinery:

Gears, axles, spindles, tie-rods, bolts/screws for shock/impact service.

Oil & Gas / General Engineering:

High-load connectors, wear-prone parts, precision components requiring high strength with toughness.

Equivalent steels for grade M3 ( М3 )

Warning! Indicated both exact and nearest equivalents.

Bulgaria	Poland	Czechia
BDS	PN	CSN
30ChGSA	30HGS 30HGSA	14331

Mechanical Properties (After Heat Treatment, Indicative)

Bars / Forgings (Quenched & Tempered):

UTS (Rm): ≥ 1,570–1,620 MPa

YS (Re): ≥ 1,370 MPa

Elongation (A5): ≥ 9%

Reduction of Area (Z): ≥ 45%

Impact Energy (KCU/KU2): ≥ 59 J

Hardness: typically > 450 HB at peak strength

Plates / Sheets (Heat-Treated):

UTS: ≥ 1,570 MPa

A5: ≥ 9%

KCU: ≥ 59 J

Seamless Tubes (Normalized / Tempered):

UTS: ≥ 588 MPa
A5: ≥ 15%

Why it matters:

The high yield strength and toughness make 30KHGSN2A ideal where weight reduction and safety margins are both critical.

Heat Treatment Guidance

Soft Anneal: 640–680 °C (or 840–860 °C) → Slow Cool

Austenitize / Quench: ~900 °C, Oil Quench

Temper: 200–300 °C (often ~260 °C) for Maximum Strength/Toughness Balance

Result: Very high strength, excellent hardenability, no temper brittleness when processed correctly.

Weldability & Machining

Weldability: Limited / Generally not recommended. If unavoidable, use controlled procedures, preheat/interpass control, and post-weld heat treatment; consult our team for procedure support.

Machining: Good in the annealed state; becomes difficult at high hardness—use rigid setups, sharp tooling, and appropriate cutting fluids.

Types of delivery of grade 30KHGSА ( 30ХГСА )

Equivalent / Related Grades

GOST/PN/TU Variants:

30HGSNA, 30HGSN2A-Sh, 30HGSN2A-VD, 30HGSN2MA / 30HGSN2MA-VD

Close Relatives:

30HGSA (30KhGSA)—lower Ni, lower toughness vs 30KHGSN2A

Selection Tip:

If you’re comparing high-strength 30KHGSN2A steel with other Cr-Mn-Si-Ni alloys, share your print/spec and we’ll map the closest supply-chain equivalent.

Specification

Mechanical properties :

Physical properties :

Why Buy 30KHGSN2A from Russian Metals

• ISO-certified supply with mill test certificates (MTC)
• Precision cutting, forging, heat-treat coordination as required
• Cleanliness options: -Sh (low S/P) and VD (vacuum-degassed) routes
• Fast delivery across India & global exports, project-ready packing
• Tech support for material substitution & process windows

Available Forms & Sizes

1. Round bars, flats, plates/sheets, seamless tubes, open-die forgings
2. Cut-to-size, rough-turned/peeled, UT/MPI tested, hardness & micro reports on request

Weldability :