With this Magento 2 Request for quote extension by Milople, you can hide product price and replace add to cart button with Request for quote button.
HOW REQUEST FOR QUOTE WORKS?
STORE ADMIN CAPABILITIES
REQUEST FOR QUOTE WILL REPLACE ADD TO CART & PRICE ON THESE PAGES
SUPPORTED MAGENTO PRODUCT TYPES
MULTI STORE AND LANGUAGE SUPPORT
We appreciate your request. If there is anything we can do at any time to enhance your experience, do let us know without hesitation.