NiMo28

Molybdenum-nickel alloy is an alloy composed of metal molybdenum as the matrix element and metal element nickel, which is one of many metal alloys, which is mainly used under the condition of reducing medium corrosion, and is the best alloy for hydrochloric acid corrosion, but in the presence of oxygen and oxidant, the corrosion resistance will be significantly reduced.

NiMo28Chemical composition：

	Ni	Mo	C	Si	Mn	Cr	Fe
Min	Bal	26	≤
Max		30	0.02	0.1	1	1	2

NiMo28Physical properties：

Density	Resistivity /μΩ ·m			Coefficient of expansion/10-6m·(m·K)-1			Thermal conductivity/W·(m·K)-1			Specific heat capacity/10-6m²/s			Elastic modulus/MPa
20℃	0℃	100℃	300℃	20~ 93℃	20~ 204℃	20~ 316℃	0℃	100℃	300℃	0℃	100℃	300℃	room temperature	316℃	538℃
9.217	1.37	1.38	1.39	10.3	10.8	11.2	11.1	12.2	14.6	3.2	3.4	3.8	217000	202000	189000

NiMo28Mechanical properties：

Variety	Check the status	Temperature/℃	ob/MPa	σp0.2/MPa	δ/%	hardness
Medium and heavy plates9.1～51mm	1066℃Quench after heating	room temperature204 316 427	902 871 840 823	407 361 336 319	61 60 60 61	94HB   —
Medium plate6.4mm	After manual TIG welding Semi-automatic after TIG welding Manual TIG welding +1066°C solid solution Semi-automatic TIG welding +1066°C solid solution	room temperature room temperature room temperature room temperature	855 821 817 796	一 一 一	一一一一	一一一一
Medium plate12.7mm	After manual TIG welding	room temperature	897

NiMo28Alloy properties：

The main differences between this alloy and NiMo28 alloy are the low carbon and silicon content (C≤ 0.02%, Si ≤0.10%), and the reduced iron content from less than 6% to less than 2%. Although the matrix structure of NiMo28 alloy is no different from that of NiMo28 alloy due to changes in carbon, silicon, and iron content, the precipitate phases on the alloy matrix or along grain boundaries are very different. The most obvious feature is that the intermetallic phase and carbide precipitation phase of 00Mo28Ni68Fe2 alloy are significantly reduced. The corrosion resistance of 00Mo28Ni68Fe2 alloy (including comprehensive corrosion resistance and intergranular corrosion resistance) has been significantly improved.

NiMo28Uses of alloys：

NiMo28 alloy produces plates, tubes (welded pipes), bars, wires, strips and forgings. It is mainly used for pipelines, vessels and their linings, reaction towers and linings, pumps and valves that are resistant to hydrochloric acid, sulfuric acid, phosphoric acid and formic acid, etc.

NiMo28Process performance：

Welding process: NiMo28 alloy has good welding performance, and because the carbon, silicon and iron content in this alloy are low, the resistance to intergranular corrosion and knife edge corrosion after welding is better than that of 0NiMo28. When the amount of iron and chromium in the alloy is appropriately controlled, the plasticity, toughness, corrosion resistance and weldability of NiMo28 alloy will be further improved. Therefore, NiMo28 alloy generally does not need to be heat treated after welding. This alloy is more suitable than NiMo28 alloy for the manufacture of welding equipment and components.

Heat treatment: Except for special uses, this alloy needs to be used after solution treatment at 1066°C. Except for those whose Fe+ Cr content in the alloy is controlled, it is generally not allowed to stay and use it for a long time between 538~816 °C.

Relevant standards：

ASTMB333 /SB333、 ASTMB622/ SB622、 ASTMB616、 ASTMB626 、 ASTMSB619、 ASTMSB626

B335 /SB335、 B564/ SB564