07X21G7AN5 - ep222 sheet, circle, wire

International Equivalent

Mark	Analogue	W. Nr.	Aisi Uns	En	Order
07X21G7AN5	EP222				Delivery from the stock, in stock

Production and application

Steel grade 07X21G7AN5 (EP222) is a chrome-manganese-nickel alloy of austenitic class. It is melted in electric arc furnaces. Also use ESHP and VDP. Production is regulated by the following GOSTs: 5632−72 and 5949−75, as well as TU 14−1-1141−74; 14−1-952−74; 14−1-2476−78; 14−1-2455−78; 14−1-3041−80. This steel is used for welded, non-welded and brazed constructions that operate at tº from -253 to 400 °C (chains, spindles, hangers in oxygen units, flanges, fasteners, thin-walled brazed and welded fragments obtained by hot and cold deformation, threaded joints, increased pigging capacity).

Percent composition

C	Cr	Si	Mn	N	Ni	P	S	Fei
≤0,07	19,5−21	≤0,7.	6−7,5	0,15−0,25	5−6	≤0,03	≤0,02	Basis

Mechanical properties (normalized) at 20 ° C

TU	Products	σ in, N/mm²	σ0,2, N/mm²	δ5, %	ψ, %	KCU, J/cm2
GOST 5949−75	Sections	700	370	40	50	130
14−1-952−74 (Ш)	Rods	670	340	40	50	130
14−1-1141−74	Rods	700	370	40	50	130
14−1-2455−78	Thick plates	700	400	25	-	-
14−1-2476−78 (W, VD)	Thin sheets	750	400	25	-	-
14−1-3041−80	Calibrated hexagons	670	340	40	50	-

Mechanical properties at cryogenic and high tº (sheet 12 mm thick, quenching process in water at 1050 ° C)

t°	σ0_{, 2}	_σB	ψ	_δ5	KCU,
degrees °С	N/mm²	N/mm²	%	%	J/cm2
-253	1240	1530	10	12	120
-70	635	880	54	52	150
20	420	760	60	60	300
100	300	700	50	73	330
200	300	680	73	50	330
300	250	650	75	50	330
400	240	600	73	50	330
500	220	530	72	47	300
600	180	450	63	45	300

_σc — Tensile strength, [MPa]

_δ5, — Relative elongation at break, [ % ]

ψ — Relative contraction, [ % ]

Mechanical properties at high tº (sheet 12 mm thick, water quenching process at 1050 °С)

t°	σ0_{, 2}	_σB	ψ	_δ5	KCU,
degrees °С	N/mm²	N/mm²	%	%	J/cm2
800	150	230	60	45	250
900	100	150	73	58	210
1000	15	50	73	72	180
1050	15	40	73	74	155
1100	-	30	72	75	150
1150	-	10	70	55	125
1200	-	10	62	50	125

_σc — Ultimate short-term strength, [MPa]

_δ5, — Relative elongation at break, [ % ]

ψ — Relative narrowing, [ % ]

Mechanical properties depending on the degree of cold plastic deformation at t=20°C (3mm thick sheet, hardening process in water before deformation from 1050°C)

Degree of compression, %	σ0,2, N/mm²	σc, N/mm²	δ5, %	Degree of compression, %	σ0,2, N/mm²	σ in, N/mm²	δ5, %
0	463	766	59,1	40	1180	1250	12,1
10	675	830	42,2	60	1299	1365	6,9
20	1109	1104	19,8	-	-	-	-

Mechanical properties in pressed condition (2 mm sheet, 20% degree of compression)

tisp, °C	σ0,2, N/mm²	σc, N/mm²	δ5, %
20	990	1050	26
-196	1500	1860	47
-253	1760	2000	9

Physical properties at 20°C

Density 7,7 g/cm3; specific resistance 0,71 Ohm — mm2/m; thermal conductivity = 19,4 W/(m — K); specific heat capacity 0,430 — 103, J/(kg — K).Modulus of normal elasticity

tisp, °С	E — 10−4 N/mm2	tisp, °С	E — 10−4 N/mm2	thisp, °С	E — 10−4 N/mm2
-253	22,3	20	20,2	700	15,2
-196	21,1	400	17,8	-	-

Temperature coefficient of linear expansion

11.5 11.5

t, °C	-253−20	-196−20	-50−20	20−100	20−200	20−300	20−400	20−500	20−600	20−700
α — 106, К-1	9.3	15.2	15.7	16.0	16.8	17.3	18.0	18.4	18.5

Corrosion resistance

In the quenched state, this steel resists intergranular corrosion according to AM and AMU methods, GOST 6032−89. It is resistant in industrial, marine atmospheres and in steam and water condensate.

Technological parameters

Steel is available for cold and hot forging and forging. Hot deformation is carried out at 1150−900°C. Cold pressure treatment is carried out in several stages. The steel retains its structural stability during cooling from +20°C to -253°C.

Welding

This steel is well welded by argon-arc method (with or without an additive), automatic under flux AN-26, manual electric arc. For additive material suitable wire Sv-10H16N25AM6 and Sv-08H15N23V7G7M2. Especially well welded with such stainless grades as 07X16H6, 12X21H5T, 12X18H10T and heat resistant alloys (XH60VT, XH77T1O). For welding with heat-resistant nickel alloys recommend a welding wire Sv06H15N60M15, and with stainless steels — Sv-04H19N11MZ. In this case the welded joints do not require heat treatment.

Mechanical properties of welded joints (exactly without heat treatment after welding)

Welding, metal thickness	tisp, °C	σw, N/mm²	KCU, J/cm2	bend angle, deg
Argon arc welding with tungsten electrodes with additive wire Sv-10C16N25AM6 Sheets 5 mm	300, 20, -196, -253	510, 700, 1410, 1510	240, 230, 130, 130
Carbon arc welding with tungsten electrodes without additive Sheet 2 mm	300, 20, -196, -253	650, 860, 1530, 1680	-, 110, 100, 90	-, 180, 180, 46

Note to the table: the steel is technological when soldering. If it is compared with 12X18N10T it has much less tendency to hot cracking in a stressed state when brazing with copper-silver brazing alloys, as well as with tin, copper, zinc based solders.

Supply

We supply certified semi-finished products of 07X21G7AN5 grade. The technical documentation includes data on chemical composition, limiting percent of impurities; mechanical properties of products. From us you can buy in bulk any products for large-scale production. We also offer optimum conditions for retail buyers. The high level of service and responsiveness of service is the face of our company.

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