The best replacement for steel beam is wood beam.

The best alternatives to steel beam are rated as following:
★★★★★  wood beam
★★★★  lvl
★★  concrete beam
★  laminate beam
  lvl beam

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Speaking about steel beam, one probably shouldn't forget about joist hangers.

Other search terms related to steel beam and their ratings are:
★★★★★ joist hangers
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