G'day All,

Our company needs to qualify a WPS for ASTM A487 Grade 4 Class D to AISI 4130 class 80K min yield.  This is to go replace a valve on an offshore drilling rig.  We have some 5" OD x 3" ID pipe in AISI 4130 class 80K min yield but I am having trouble to locate suitable coupons in ASTM A487 Grade 4 Class D.  Could anyone recommend a reputable supplier for this ASTM A487 Grade 4 Class D coupons?

Thanks