Main Features

Superior resistance to hydrochloric acid and sulfuric acid MA-B2 is especially suited for equipments that handle hydrochloric acids of all concentrations and at any temperature up to the boiling point. Also it is corrosion-resistant to hydrogen chloride gases, sulfuric acids, acetic acids, and phosphoric acids. However, it is not recommended to be used in environments which contain a certain amount of ferric salt or cupric salt), since corrosion may occur in somecases. For example, if hydrochloric acid comes into contact with iron or copper, ferric salt or cupric salt may be formed. In processes containing hydrochloric acids, if the alloy is used to connect steel (iron) pipes or copper pipes, MA-B2 might be damaged by corrosion at an early stage.
MA-B2 is the improved version of the alloy, MA-B. It has the same superior corrosion resistance as MA-B, while having an improved corrosion resistance against the knife-line-attack and in the heat-affected zone. Since MA-B2 has little carbide precipitation along the crystal grain boundaries of the welded heat-affected zone, this alloy can be used in the as-welded state for almost any chemical processes.

High temperature resistance atmosphere

Since MA-B2 loses its ductility when it is exposed to temperatures between 538∼870°C, processing and use in this temperature range must be avoided. When using MA-B2 within oxidizing gases such as air, the temperature should be 538°C or lower. For use in reducing gases or vacuity, the alloy can be used in high temperatures, such as 870°C or higher.

Workability

MA-B2 is an original alloy provided only by MMC Superalloy Corp., has drastically improved the decreasing tendency of mechanical elasticity at medium temperatures, which used to be an initial problem.

Available Product Forms

Various shapes, such as flat-rolled plates, forgings, welding wire, wire, welded pipes and tubes, seamless pipes and tubes can be manufactured.

Specifications

Information on specifications to which MA-B2 alloy can be ordered.

ASTM UNS N10665

Plates	Bars, Forgings	Pipes and Tubes	Joints
B333	B335	B619	B366
	B564	B622
		B626

ASME UNS N010665

Plates	Bars, Forgings	Pipes and Tubes	Joints
SB-333	SB-335	SB-619	SB-366
	SB-564	SB-622
		SB-626

JIS ALLOY NW0665

Plates	Bars	Pipes and Tubes	Wires
H4551	H4553	H4552	H4554

Corrosion Resistance

Corrosion data
The data below are examples of beaker tests, and do not guarantee maximum or minimum values.
Selection of materials for individual usage requires tests using actual equipments.

Solution	Concentration(wt%)	Temperature(°C)	Corrosion Rate(mm/Year)
Hydrochloric acid	1	boiling	<0.03
	3	50	0.19
	5	room temperature	0.07
	36	boiling	0.03
Sulfuric acid	1	boiling	0.025
	40	100	0.04
	40	80	0.06
	40	60	0.01
	40	40	0.01
	80	120	0.01
	80	100	0.01
	80	80	0.00
	80	60	0.00
	80	40	0.00
	98.5	150	0.70
	98.5	130	0.14
	98.5	110	0.04
	98.5	90	0.02
Phosphoric acid	5	boiling	0.205
	50	50	0.016
Formic acid	88	boiling	0.02
Acetic acid	99	boiling	0.03