Reports from the union that represents striking workers at Allegheny Technologies, Inc. steel mills in the region are saying that a deal is in place to end the steelworkers’ strike at ATI. The union says it’s reached a tentative agreement with the company. Contract talks had hit a wall over healthcare costs. On Friday night, the union says it had “preserved premium-free health insurance” and secured better pay. Workers will have to ratify the deal in the coming weeks. Around 1,300 employees at nine facilities have been on strike for the last three months.