The domestic steel industry got some help but the leather industry didn't, as the House continued work yesterday on a bill to extend the export control law.

Rep. Paul Findley (R-Il.) won adoption, 238 to 165, of an amendment providing public hearings for users of scrap metal-- steel companies-- who contend they would be hurt by unlimited exports of scrap, and requiring the Commerce Department to publish its decision to permit exports and the reasons for it. Opponents denied there is a shortage of scrap metal here.

The leather industry lost, 218 to 186, but won more support than before in its efforts to limit exports of cattle hides. Rep. James Shannon (D-Mass.), sponsoring the legislation, said he was trying to save the jobs of 400,000 leather workers who would suffer from export-created shortages here. Opponents called the proposal "blastant protectionism" and insisted there is no shortage of raw leather in this country.

Rejected by a voice vote was an attempt by Rep. James Weaver (D-Ore.), to require that exported wheat, corn and soybeans be sold at not less than 80 percent of parity. There is no reason for the United States to sell low and buy high, he argued.

But opponents said it would only set up another non-tariff trade barrier of the type the United States and its trading partners are trying to abolish.