00Cr29Mo4Ni2

HuaNickel 00Cr29Mo4Ni2 is a Cr29Mo4 super ferritic stainless steel containing 2% Ni, the addition of nickel makes this steel have higher toughness and lower brittle transition temperature than non-high-purity Cr29Mo4 steel. The high chromium and molybdenum content make this steel have better overall corrosion resistance, pitting corrosion resistance, and crevice corrosion resistance.

00Cr29Mo4Ni2Chemical composition：

	Cr	Ni	Mo	C	N	C+N	Mn	P	S	Si	Cu
Min	28	2	3.5	≤
Max	30	2.5	4.2	0.01	0.02	0.025	0.3	0.025	0.02	0.2	0.15

00Cr29Mo4Ni2Physical properties：

Density/g ·cm-	Linear expansion coefficient(21～100℃)a /10-6·K-1	Specific heat capacityc/J(kg·K)-1	Thermal conductivityλ/W·(m·K)-1 (21～100℃）	Resistivityg /μΩ ·m
7.7	9.4	448	17	0.72

00Cr29Mo4Ni2Mechanical properties：

Steel varieties	Heat treatment status	σp0.2/MPa	σb/MPa	δ/%	Hardness(HRB)
Pipe	Annealed state	550	690	25	B95
Plate	Annealed state	515	655	25	B95
ASTmin	Annealed state	415	550	20

00Cr29Mo4Ni2 Alloy properties：

This steel annealed state has a single ferrite structure. However, at medium temperature (e.g. welding) heating, for example, there will be intermetallic phase σ(x) precipitation near 750~950°C (see Fig. 1-1-47), and at the same time, carbide Crz₃C₆ and nitride Cr₂N will precipitate above 950°C. Because this steel has a higher molybdenum content than the aforementioned 00Cr28Ni4Mo2 steel, it is more sensitive to the precipitation of σ phases.

00Cr29Mo4Ni2Uses of alloys：

This steel can be used in heat exchange equipment with seawater and Cl- water as cooling medium, and can also be used in acidic media such as sulfuric acid, formic acid, acetic acid, oxalic acid, etc.

00Cr29Mo4Ni2Process performance：

Welding performance: In order to make HuaNickel 00Cr29Mo4Ni2 steel have good post-welding performance in the welding process, it is necessary to maintain the high cleanliness of this steel.

Heat treatment: The suitable heat treatment process for this steel is 950~1050 °C heating and heat preservation and quenching. If it is lower than 950°C, the toughness and corrosion resistance of the steel will be reduced due to the precipitation of σ(x) phase; Above 1050°C, the performance of steel will be reduced due to the precipitation of carbon and nitride.

Relevant standards：ASTM E1005-86