【Daily Question: Pump Equipment】Fill-in-the-blank question, 3/20/2019
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bk14.jpg Rules for fill-in-the-blank questions: 1. If both answers are incorrect, +2 wealth is given for active participation; if one answer is correct and the other is incorrect, +5 wealth is given; if both answers are correct, +8 wealth is given. 2. If only one answer is provided, unless it is clear which question’s answer it is, a correct answer earns +5 wealth points, while an incorrect answer earns +2 wealth points; in all other cases, it is counted as active participation and awards +2 wealth points. 3. Rewards for answers are available once per person only. 4. Each reply allows scoring for only one person. 5. The answer and its explanation will be visible after responding. 6. The reward is valid for 48 hours; no reward will be given if the deadline is missed. The student has won awards again; I come here every day. I often see that the material of bolts in fasteners is A2-70. What does A2 mean, and what does 70 mean? Answer (Austenitic steel, Group 2 materials, usually referring to 304) ； (The mechanical property grade of the product; the number represents 1/10 of the nominal tensile strength, that is, the tensile strength is 700 N/(mm*mm)
A2 denotes the material category, while 70 indicates the performance grade of the product
1. Austenitic stainless steels, Group 2； 2. The tensile strength is 700 N/m²
A2 refers to the second group of austenitic steels, that is, the 304 stainless steel material； 70 indicates the performance grade of the product; this number is 1/10 of the nominal tensile strength. The tensile design value for A2-70 bolts is 700 MPa
304 stainless steel, with a tensile strength of 700 N
A2: 304 stainless steel； 70: Tensile strength, 700 N/mm2.
The meaning of A2 is 304 austenitic stainless steel, while 70 refers to the mechanical properties of the product, specifically 1/10 of the nominal tensile strength.
Cold-worked austenitic steel, minimum tensile strength of 700 MPa