Corrosion
(UR) Corrosion Resistance
  UR30 and UR31 are excellent alloys in dezincification corrosion resistance.

UR34 are forging material, they are inferior in de-zincification corrosion resistance to other UR series in rod form. However, the application of heat treatment after forging produces excellent dezincification corrosion resistance, other UR series are similar.
   
 
Dezincification Corrosion Resistance Test
Alloy Size ISO 6509 test result JBMA T－303 test result
Max. corrosion depth (μm) Ave. corrosion depth (μm) Corrosion form Max. corrosion depth (μm) Ave. corrosion depth (μm) Corrosion depth
UR30 T4 20 <10 凹凸 20 <10 凹凸
φ4 20 <10 凹凸 20 <10 凹凸
UR31 φ20 20 <10 凹凸 30 10 凹凸
φ35 20 <10 凹凸 30 10 凹凸
UR34 φ28 330 180 β phase － － －
Forging
*1		 30 <10 γ phase 40 20 凹凸
C2680 t4 380 280 Whole phase 110 90 Whole phase
C2700 φ4 400 300 Whole phase 120 100 Whole phase
C36000 φ26 1000 900 Whole phase 160 70 Plug -shaped corrosion
C37700 φ25 1100 950 Whole phase 180 140 β phase
forging 900 800 Whole phase 160 140 β phase
C46400 φ25 700 400 Whole phase 140 90 β phase
C83600 φ21 <10 <10 No corrosion <10 <10 No corrosion
  *1: After forging, heat treatment is applied.
Long Time Sea Water Immersion Test
Sea water corrosion resistance of UR
ALLOY Exposure: Two Years Exposure: Five Years
Max.
corrosion depth(μm)		 Ave.
corrosion depth(μm)		 Corrosion form Max.
corrosion depth(μm)		 Ave.
corrosion depth(μm)		 Corrosion form
UR30 15 <10 凹凸 20 <10 凹凸
UR31 20 <10 凹凸 30 <10 凹凸
C27000 1100 650 Whole phase penetration 1000 Whole phase
C28000 460 340 Whole phase 　 　 　
C37700 560 210 β phase 1200 700 Whole phase
C46400 460 80 β phase 500 420 Whole phase
5052 penetration － pitting penetration － pitting
S30400 200 <10 凹凸 　 　 　
 

Contents

(UR) Ultra Resistance
Physical Properties
Corrosion Resistance
Product Lineup
Mechanical Properties
Chemical Composition
Sizes