The problems that ferritic steel produces during welding are ( ) and ( ).
A: Grain refinement
B: Intergranular corrosion
C: Toughness increase
D: Hardening tendency
A: Grain refinement
B: Intergranular corrosion
C: Toughness increase
D: Hardening tendency
举一反三
- Boron is added to structural steel to increase its ( ). A: tempering stability B: toughness C: hardenability D: hardening capacity
- Which of the following are characteristics of the steel structure? A: High strength and low weight B: Good plasticity and toughness C: Easy to manufacture and construct D: Weak corrosion resistance
- With （）， the corrosion problems are much reduced in a central cooling system.
- If the heating temperature is increased after recrystallization, ( ) will take place. A: secondary recrystallization B: fine grain strengthening C: work hardening D: solid solution strengthening
- Suppose that the United States eliminates its tariff on steel imports, permitting foreign-produced steel to enter the U.S. market. Steel prices to U.S. consumers would be expected to: A: Increase, and the foreign demand for U.S. exports would increase B: Decrease, and the foreign demand for U.S. exports would increase C: Increase, and the foreign demand for U.S. exports would decrease D: Decrease, and the foreign demand for U.S. exports would decrease