原帖由 chenjianming327 于 2007-11-9 09:24 发表 " G5 d c% P# x& {
应该感 生生世世 很对的啊 * h+ \: H/ h# T. W) f# \2 T4 }9 B. q
: f. h/ p3 p) l/ M5 X! L你什么意思?
, M# k, r e( \. F7 o; ?( VASTM A513-07 Standard Specification for Electric-Resistance-Welded Carbon and Alloy Steel Mechanical Tubing' Y6 E3 l- p" z8 }) g
1. Scope
9 ~' C+ w, A( y8 I1 R1.1 This specification covers electric-resistance-welded carbon and alloy steel tubing for use as mechanical tubing. / T/ W4 N5 i- I# f
1.2 This specification covers mechanical tubing made from hot- or cold-rolled steel.2 L$ o+ U2 D Y
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) |
1 W/ `: G9 A& e7 M! s1.4 Optional supplementary requirements are provided and when desired, shall be so stated in the order.
) |0 U, c/ o# E6 x1.5 The values stated in inch-pound units are to be regarded as the standard. |