That material may have some of the original spring shap0e left in it, if that is how it wants to bend when you quench it. Get it hot and straighten it, normalize two or three times and then try and harden it. Make real sure you push the blade into the oil straight and not move it side to side as it drops temp. After you harden it if there is a wee bit of bend you have a few seconds after you temper to take the bend out. Since you said it was thin already you best option may be to mark it tuition and hang it on the wall and start fresh.......
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