Material Options
Material Options
(OP)
Could you all please share some material options meeting most if not all of the following criteria:
- Comparable in strength to SA 193 material
- Suitable for clamping loads
- Preferably available in forged bar form
- Belonging to the steel family
Any and all feedback will be greatly appreciated!
Thanks!
- Comparable in strength to SA 193 material
- Suitable for clamping loads
- Preferably available in forged bar form
- Belonging to the steel family
Any and all feedback will be greatly appreciated!
Thanks!





RE: Material Options
Based on the OP AISI 4130 or 4140 come into mind as being readily available.
RE: Material Options
If the material is for trim or non-pressure retaining applications, you can use carbon steel as long as it is proven weldable, and you have some means of identifying the material for use.
RE: Material Options
It is true however that you could be limited by the applicable design code.
SA 193 is a specification with multiple material grades and each of these grades have their own mechanical characteristics, it would be more helpful to define what grade you are comparing against.
RE: Material Options
SA-197 Grade B7 is more specifically the grade I'l like to compare against.
No welding required.
As I said earlier, we would like to use this material for holding clamping loads - essentially to hold two flanges together.
Thanks!
RE: Material Options
RE: Material Options
A certain inspector disallowed me from using it since according to him, "A bolting material can only take longitudinal loads, it is tested as such during the manufacturing process and is therefore unsuitable for use in clamping loads where the load might not be strictly longitudinal".
Your comments on this will be appreciated!
Thanks
RE: Material Options
We used B7 and B16 in all sorts of configurations to all manner of possible shear and bending loads. I can't anytime where anything but these materials were considered.
Could you possibly give more details of you application.
RE: Material Options
I would certainly love to have some ammunition against his argument. However, other than experience, I do not really have a whole lot - the fact that the material is rolled and tested for longitudinal loads is quite true.
Have you ever come across a similar argument before, unclesyd?
RE: Material Options
Could you post a picture or drawing of your flange arrangement?
What are your operating conditions?
It is hard to visualize any flange where a B7 or B16 bolt wouln't be satisfactory. It is also hard to visualize where hydraulic end force wouln't be governing as any other flange loads shouldn't put that much additional loads on the flange to where you would have that much effect. You can take the allowable tensile and take 62% of that value and you will have a shear strength value to use in any calculation you could require. You can get a bend of greater than 60 degrees in these fasteners with no problem.