CSA G40.21 50W是什么材料，各字母或数字是什么意思

请问图面里红圈处的材料代号，各字母或数字，各是什么意思？有没有这方面的资料呢。
我上网找了，CSA 是canadian standard association的意思，但其它的字母或数字，不知道什么意思。

Mechanical Properties 50W/350W:
Tensile: 65 to 95 ksi
Yield: 50 ksi min
Elongation: 19% min in 8” 22% min in 2”

CSA-加拿大标准协会
G40.21--材料标准
50W--屈服50KSI， 大约是345Mpa.

ylxjtu 发表于 2023-9-17 12:15
Mechanical Properties 50W/350W:
Tensile: 65 to 95 ksi
Yield: 50 ksi min...

谢谢，我要怎么给您加分呢？

1.3 The following types of steel are covered by this Standard: (a) Type W - Weldable Steel Steels of this type meet specified strength requirements and are suitable for general welded construction where notch toughness at low temperatures is not a design requirement. Applications include buildings, compression members of bridges, etc.

这是关于50W的这个W的意思。
后缀还有WT、R、A、AT、Q、QT等等。

CSA G40.21-50W
Similar in properties to the more common 44W, but with higher yield
strengths. Limited availability in structural shapes and plate material.
Widely used in the production of hollow structural sections.
Yield Strength - 50,000 PSI minimum
Tensile Strength - 65 - 90,000 PSI minimum

低合金钢
G40.21规定了材料性能和用途

请问您有这个标准吗?CSA G40.21

请问 有这个CAN/CSA G40.21  标准码？如果有请分享十分感谢！