Steel 12DN2FL

Designation

Name	The value
Designation GOST Cyrillic	12ДН2ФЛ
Designation GOST Latin	12DH2FL
Transliteration	12DN2FL
By chemical elements	12CuН2V

Description

12DN2FL steel is used: for the manufacture of litho-and combined welded structures and castings for critical loaded parts, which are requirements of high strength and toughness, working under static and dynamic loads at temperatures up to +400 °C.

Standards

Name	Code	Standards
Steel castings	В82	GOST 977-88, OST 3-4365-79

Chemical composition

Standard	C	S	P	Mn	Si	Ni	Fe	Cu	V
GOST 977-88	0.08-0.16	≤0.035	≤0.035	0.4-0.9	0.2-0.4	1.8-2.2	Rest	1.2-1.5	0.08-0.15

Fe is the basis.

Mechanical properties

Section, mm	s_T\|s_0,2, MPa	σ_U, MPa	d₅, %	y, %	KCU, kJ/m²	HB, MPa
Normalization at 910-930 °C + vacation at 530-560 °C, air cooling
100	≥540	≥638	≥12	≥20	≥294	170-229
Normalization at 920-930 °C (maintained for 5 h), air cooling + vacation at 520-530 °C (exposure 6 h), cooled with the furnace for 1 h, air cooling (named place of clippings sample)
100	500-510	600-630	23-26	46-54	-	-
Normalization at 920-930 °C (maintained for 5 h), air cooling + vacation at 520-530 °C (exposure 6 h), cooled with the furnace for 1 h, air cooling
-	460-500	580-620	19-24	49-64	-	-
Normalization at 940-950 °C + tempering air with 890-910 °C + vacation at 560-600 °C, air cooling
100	≥638	≥785	≥12	≥25	≥392	-
Normalization at 920-930 °C (maintained for 5 h), air cooling + vacation at 520-530 °C (exposure 6 h), cooled with the furnace for 1 h, air cooling (named place of clippings sample)
100	500-510	620-640	23-27	48-64	-	187-206
Normalization at 920-930 °C (maintained for 5 h), air cooling + vacation at 520-530 °C (exposure 6 h), cooled with the furnace for 1 h, air cooling
-	415-470	540-500	8-18	28-58	-	-
Normalization at 920-930 °C (maintained for 5 h), air cooling + vacation at 520-530 °C (exposure 6 h), cooled with the furnace for 1 h, air cooling (named place of clippings sample)
200	490-510	500-610	11-16	19-36	-	196-206
Normalization at 920-930 °C (maintained for 5 h), air cooling + vacation at 520-530 °C (exposure 6 h), cooled with the furnace for 1 h, air cooling
-	410-450	500-600	11-18	19-53	-	-
Normalization at 920-930 °C (maintained for 5 h), air cooling + vacation at 520-530 °C (exposure 6 h), cooled with the furnace for 1 h, air cooling (named place of clippings sample)
200	500-520	570-640	9-24	21-54	-	196-206
Normalization at 920-930 °C (maintained for 5 h), air cooling + vacation at 520-530 °C (exposure 6 h), cooled with the furnace for 1 h, air cooling
-	380-410	500-550	13-20	30-51	-	-
Normalization at 920-930 °C (maintained for 5 h), air cooling + vacation at 520-530 °C (exposure 6 h), cooled with the furnace for 1 h, air cooling (named place of clippings sample)
30	490-540	630-660	21-27	55-64	-	187-196
Normalization at 920-930 °C (maintained for 5 h), air cooling + vacation at 520-530 °C (exposure 6 h), cooled with the furnace for 1 h, air cooling
-	315-355	390-420	15-21	37-53	-	-
Normalization at 920-930 °C (maintained for 5 h), air cooling + vacation at 520-530 °C (exposure 6 h), cooled with the furnace for 1 h, air cooling (named place of clippings sample)
50	510-550	610-670	25-26	49-62	-	187-196

Description mechanical marks

Name	Description
s_T\|s_0,2	Yield strength or limit of proportionality with a tolerance for residual deformation of 0.2%
σ_U	Limit short-term strength
d₅	Elongation after rupture
y	The relative narrowing
KCU	Toughness
HB	Brinell hardness number

Physical characteristics

Temperature	Е, HPa	G, HPa	r, kg/m³	l, W/(m · °C)	R, Mr. · m	a, 10^-6 1/°C	С, J/(kg · °C)
0	211	82	7860	37	210	-	-
20	211	-	7860	37	210	-	-
100	206	80	-	38	268	115	487
200	196	76	-	38	339	123	504
300	189	74	-	38	426	129	517
400	181	70	-	37	545	131	529
500	174	67	-	34	641	137	559
600	155	59	-	32	787	142	575
700	135	51	-	29	939	141	617
800	127	48	-	27	1109	108	689
900	-	-	-	27	1158	108	689
1100	-	-	-	-	-	126	685

A description of the physical symbols

Name	Description
Е	The normal elasticity modulus
r	Density
l	Coefficient of thermal conductivity
R	UD. the resistivity

Technological properties

Name	The value
Weldability	well welded RDS