原帖由 chenjianming327 于 2007-11-9 09:24 发表 
; z( s6 S# k4 t9 Y, n应该感 生生世世 很对的啊
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你什么意思？
( x. c" B8 l4 MASTM A513-07 Standard Specification for Electric-Resistance-Welded Carbon and Alloy Steel Mechanical Tubing9 c' l1 u( P) C
1. Scope
0 X, d0 ]+ v5 A7 k0 f, A. P; W1.1 This specification covers electric-resistance-welded carbon and alloy steel tubing for use as mechanical tubing. 8 s5 F8 X# z$ @* c
1.2 This specification covers mechanical tubing made from hot- or cold-rolled steel.9 S5 [, e$ `# Q( V
1.3 This specification covers round, square, rectangular, and special shape tubing. | Type | Size Range(Round Tubing) | | Electric-Resistance-Welded Tubing from Hot-Rolled Steel | outside diameter from 1/2 to 15 in. (19.0 to 381.0 mm) | | wall from 0.065 to 0.650 in. (1.65 to 16.50 mm) | | Electric-Resistance-Welded Tubing from Cold-Rolled Steel | outside diameter from 3/8 to 12 in. (9.92 to 304.8 mm) | | wall from 0.022 to 0.134 in. (0.71 to 3.40 mm) |
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1.4 Optional supplementary requirements are provided and when desired, shall be so stated in the order. 7 C! X! l% Q. P$ G8 N' M3 e! C
1.5 The values stated in inch-pound units are to be regarded as the standard. |
发表于 2007-10-10 10:23:16
这个大家都想要啊！
