AL 29-4C

HuaNickel AL 29-4C is one of the earliest super ferritic stainless steels, which solves the severe corrosion problems of pitting, crevice corrosion and stress corrosion of commonly used chromium-nickel austenitic stainless steels in Cl-containing aqueous media (including seawater). The steel has long been used in media environments such as power plants, seawater condensers and desalination plants, and can replace super austenitic stainless steels, titanium alloys and copper alloys.

AL 29-4C Chemical composition：

	C	Si	Mn	Cr	Ni	Mo	S	P	N	Ti+Nb	Co
Min	–	–	–	–	–	–	–	–	–	–	–
Max	0.02	0.4	0.5	29	0.3	4	0.01	0.03	0.0.2	0.5	0.03

AL 29-4CPhysical properties：

Elastic modulusGPa	Thermal conductivity/W·(m·℃)-	Coefficient of thermal expansion/10~6·℃-1	Density /g·cm-3
200	17	17.2	7.67

AL 29-4CMechanical properties：

Material grade	Mechanical properties
	σb/MPa	σp0.2/MPa	δ/%
AL 29-4C	655	552	20

AL 29-4CAlloy properties：

Due to the high amount of chromium and molybdenum in HuaNickel AL 29-4C, σ phases, nitrides and carbides will precipitate during aging at medium temperatures (e.g. welding, hot working and thermoforming, etc.), resulting in a decrease in plasticity, toughness and corrosion resistance of this steel, for which measures need to be taken to prevent it during the production and welding of this steel.

AL 29-4CUses of alloys：

It is mainly used in seawater condensers in power plants, and has achieved good long-term use results.

AL 29-4CProcess performance：

Welding process: HuaNickel AL 29-4C has good weldability, and this steel can be used to produce welded pipes. In the manufacture of heat exchange equipment, such as seawater condensers, AL 29-4C steel pipes are welded to tubesheets without difficulty.

Heat treatment: The heat treatment process of this steel is 950~1100 °C heating, heat preservation and fast cooling.

Relevant standards：ASTM A240/A240M-2020