ASTM A732? 4130 Low Carbon Steel .3 carbon content, Not sure but this comes to mind and I didn't have the correct ASTM book to check it out.
John Wright

There have been numerous posts in this forum on this subject. Click the search button, enter 4130 in the keywords box, 999 in the age box and 100 in the number of posts box. That will return a list of most of them. You can also search for chromoly or chrome-moly. This article from an authoritative source, The Lincoln Electric Compmany, is often cited: http://www.lincolnelectric.com/knowledge/articles/content/chrome-moly.asp

Dave

For heavy wall pipe applications we use a GTAW/SMAW combination. ER80S-D2 (root & hot passes), E10018-D2 (remainder). Preheat to 450F, maintain. PWHT at 1175F for two hours. We use a temper bead technique. Argon shielding and backing gas.

For the PQR we were limited to 22 HRC (NACE MR0175 requirement) and we had to comply with impact testing requirements (LRNA requirement). Our heat input upper limit is 30 kj/in.

Hope it's helpful.
Charles Hall

rhoople,
4130 is a SAE designation meaning a chemical composition. A-XXX is an ASTM designation meaning, apart from chemical composition, mechanical properties and a number of other parameters such as metallographic structure (austenitic, ferritic etc.), fabrication method (electric furnace p. ex.), presentation form (plate, pipe etc.), destructive and non destructive tests to be done etc. etc.
Although there is no an exact equivalence between SAE and ASTM steels, the Unified Numbering System (UNS) has tried to introduce an equivalence as precise as possible. You'll find an UNS table on any good engineering handbook, such as Perry's Chemical Engineer Handbook.
I don't have Perry at hand in this moment, otherwise I'd have tried to help you a bit more.
Giovanni S. Crisi
Sao Paulo - Brazil