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Updated on: 27 Oct 2023, 11:46
Originally posted by Sajjad1994 on 18 May 2021, 21:00.
Last edited by BottomJee on 27 Oct 2023, 11:46, edited 2 times in total.
Last edited by BottomJee on 27 Oct 2023, 11:46, edited 2 times in total.
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Stainless steels are alloys of iron and carbon that also contain a minimum of 10.5% chromium and various amounts of other alloying materials, which may include molybdenum, manganese, and nickel, among others. Stainless steels are designated with three-digit SAE numbers generally ranging from the 200s to the 600s, sometimes followed by a single letter. The three most common categories of stainless steel are described below, and examples of seven specific varieties from within these three categories are listed in the tables that follow.
Ferritic steels contain 12.5%–17% chromium, less than 0.1% carbon, and up to 1% nickel. Ferritic steels are magnetic and can be strengthened by cold working but cannot be heat treated. They are commonly used in automotive exhaust systems, agricultural equipment, and high-heat applications such as furnaces and boilers.
Austenitic steels contain 16%–26% chromium, not more than 0.8% carbon, and 6%–15% nickel. They are nonmagnetic and are not heat treatable. Austenitic steels are the most common type of stainless steel globally, and they are commonly used in food-processing equipment, piping, and kitchen utensils.
Martensitic steels contain 10.5%–17% chromium, up to 1.2% carbon, and not more than 0.4% nickel. They are magnetic and heat treatable. Martensitic steels are commonly used in knives, cutting tools, and dental and surgical equipment.
Ferritic steels contain 12.5%–17% chromium, less than 0.1% carbon, and up to 1% nickel. Ferritic steels are magnetic and can be strengthened by cold working but cannot be heat treated. They are commonly used in automotive exhaust systems, agricultural equipment, and high-heat applications such as furnaces and boilers.
Austenitic steels contain 16%–26% chromium, not more than 0.8% carbon, and 6%–15% nickel. They are nonmagnetic and are not heat treatable. Austenitic steels are the most common type of stainless steel globally, and they are commonly used in food-processing equipment, piping, and kitchen utensils.
Martensitic steels contain 10.5%–17% chromium, up to 1.2% carbon, and not more than 0.4% nickel. They are magnetic and heat treatable. Martensitic steels are commonly used in knives, cutting tools, and dental and surgical equipment.
All of the listed stainless steels with a carbon content of 0.08% are Austenitic.: No
A stainless steel among those listed with a Rockwell hardness of at least 85 must be either Austenitic or Ferritic.: Yes
Of the steels listed, the average density of Austenitic steels is greater than the average density of Ferritic steels.: Yes
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
85%
(hard)
Question Stats:
45% (04:10) correct
55%
(03:56)
wrong
based on 552
sessions
History
Date
Time
Result
Not Attempted Yet
1. Consider each of the following statements. Indicate Yes if the given information supports the statement. Otherwise, indicate No.
| Yes | No | |
| All of the listed stainless steels with a carbon content of 0.08% are Austenitic. | ||
| A stainless steel among those listed with a Rockwell hardness of at least 85 must be either Austenitic or Ferritic. | ||
| Of the steels listed, the average density of Austenitic steels is greater than the average density of Ferritic steels. |
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Official Answer
All of the listed stainless steels with a carbon content of 0.08% are Austenitic.: No
A stainless steel among those listed with a Rockwell hardness of at least 85 must be either Austenitic or Ferritic.: Yes
Of the steels listed, the average density of Austenitic steels is greater than the average density of Ferritic steels.: Yes
89
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
15%
(low)
Question Stats:
77% (01:14) correct
23%
(01:24)
wrong
based on 594
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History
Date
Time
Result
Not Attempted Yet
2. Based on the information in the passage and tables, the stainless steel with the highest ratio of carbon to nickel has which of the following hardness ratings?
| 80 | |
| 85 | |
| 89 | |
| 90 | |
| 95 |
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Attachment:
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21 May 2021, 10:47
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Hi
OA of this question has been updated, It is:
No, Yes and Yes for question #1
C for question #2
Let me know if need help with the explanation.
