2.4819

HuaNickel 2.4819 is a nickel-molybdenum-chromium-iron-tungsten alloy that is one of the most corrosion-resistant alloys currently available. 2.4819 alloy is widely used in harsh environments in specialized fields such as chemical and petrochemical processing, flue gas desulfurization, and pulp and paper. The alloy is designed to maintain a high level of corrosion resistance even under welded conditions.

2.4819Chemical composition：

	Ni	Cr	Mo	W	Fe	C	Si	Mn	P	S	V	Co
Min	Bal	14.5	15	3	4	≤
Max		16.5	17	4.5	7	0.02	0.08	1	0.04	0.03	0.35	2.5

2.4819Physical properties：

Density  (22℃)		Melting point/℃		Resistivity/ μΩ·m(24℃)		Linear expansion coefficient/×10-6m·(m·K)-1
						24~93℃	24~204℃		24~316℃	24~427℃		24~538℃		24~649℃
8.8		1323～1371		1.30		11.2	12.0		12.8	13.2		13.4		14.1
Thermal conductivityW·(m·K)-1								Specific heat capacity/J·(kg·K)-1(room temperature)			Elastic modulus/MPa
32℃	93℃		204℃		538℃	1092℃					room temperature		204℃		316℃
9.4	11.4		13.0		19.0	28.1		427			205000		195000		188000

2.4819Mechanical properties：

Species	Heat treatment conditions	Test temperature/℃	Mechanical properties
			σb/MPa	σp0.2/MPa	δ/%
Plate，2mm	1121℃Solution treatment (water-cooled)	room temperature204 316 427	792 694 681 650	356 290 248 225	61 59 68 67
Plate，2.4mm	1121℃Solution treatment (water-cooled)	204 316 427	696 673 645	275 231 205	58 64 64
Plate，1.6～4.7mm	1121℃Solution treatment (water-cooled)	204 316 427 538	695 669 655 613	290 260 240 233	56 64 65 60
Plate，4.8～25.4mm	1121℃Solution treatment (water-cooled)	204 316 427 538	682 650 631 601	263 235 225 226	61 66 60 59
Plate，25.4mm	1121℃Solution treatment (water-cooled)	room temperature 316 427	785 664 654	365 250 210	59 63 61
Sheet, 2.4mm (original thickness)	Cold deformation0% Cold deformation10% Cold deformation20% Cold deformation30% Cold deformation40% Cold deformation50%	room temperature room temperature room temperature room temperature room temperature room temperature	806 894 1021 1171 1336 1449	434 636 890 1083 1261 1347	67 48 26 15 9 7

2.4819 Alloy properties：

Corrosion resistance

(1) Comprehensive corrosion

medium	concentration/%	temperature/℃	Corrosion rate/mm ·a-
			Solid solution	Soldered state	Soldering + post-weld heat treatment
Chromic acid	10	boils	1.65	2.06	1.06
formic acid	20	boils	0.12	0.05	0.09
hydrochloric acid	10	66	0.53	0.51	0.53
hydrochloric acid	10	75	1.02	1.27
hydrochloric acid	10+0.1FeCl₃	75	0.99	1.14
hydrochloric acid	10+0.05NaOCl	75	1.17	1.27
hydrochloric acid	3.5+8FeCl₃	88		0.13
hydrochloric acid	1.0+25FeCl₂	93		1.14
hydrochloric acid	0.1+2.5FeCl₂	66		无
nitric acid	10	boils	0.41	0.43	0.43
nitric acid	10+3HF	70	8.89	9.65	—
sulphuric acid	10	boils	0.38	0.36	0.46
sulphuric acid		75	0.43	0.43
Wet chlorine		66	0.01
Wet chlorine		80	0.02

2.4819Uses of alloys：

HuaNickel 2.4819 alloy is used in metallurgical plants to produce plates (including sheets and plates of medium and heavy plates), tubes, wires, strips, bars, as well as forgings and castings.

2.4819Process performance：

Welding process: HuaNickel 2.4819 alloy has good welding properties and can be welded using common welding methods without special difficulties. TIG, MIG, and manual arc welding are the most commonly used. However, acetylene welding is not recommended when used for corrosion-resistant applications. In the welding process, it is necessary to prevent excessive heat input, and special attention should be paid to submerged arc welding.

Heat treatment: In the absence of special regulations and requirements,HuaNickel 2.4819 alloy is solution treated, i.e. quenched after heating at 1121°C. In this state, the 2.4819 alloy is optimal

Relevant standards：

SB 575/B 575 SB 574/B 574 、B 472、SB 622/B 622 、SB 619/B 619 、SB 626/B 626、SB 366/B 366 SB 462/B 462 、SB 564/B 564 、SB 462/B 462