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A tube support structure for heat transfer tubes in a steam generator has a plurality of tube support bars which are installed between the heat transfer tubes. At least one of the support bars has a first metal layer and a second metal layer. The first metal layer is preferably spot welded to the se

A tube support structure for heat transfer tubes in a steam generator has a plurality of tube support bars which are installed between the heat transfer tubes. At least one of the support bars has a first metal layer and a second metal layer. The first metal layer is preferably spot welded to the second metal layer at intervals. The first metal layer and second metal layer have different thermal expansion coefficients so that at room temperature the support bar is flat, and at the operating temperature of the steam generator the first layer forms a convex shape between the intervals to support the adjacent tube.

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I claim: 1. A tube support structure for use within an array of heat exchanger tubes, each tube having a diameter and a longitudinal axis, the tube support structure comprising: a tube support bar for use between a pair of heat exchanger tubes, the support bar comprised of a first metallic strip at

I claim: 1. A tube support structure for use within an array of heat exchanger tubes, each tube having a diameter and a longitudinal axis, the tube support structure comprising: a tube support bar for use between a pair of heat exchanger tubes, the support bar comprised of a first metallic strip attached to a second metallic strip at spaced intervals, the first strip having a coefficient of thermal expansion greater than the second strip, wherein the first strip is attached to the second strip at spaced intervals in a direction transverse to the length of the second strip, and wherein the first strip is attached to the second strip at spaced intervals of about 2 tube diameters. 2. The tube support structure of claim 1, wherein the first and second strips are flat at a first temperature, and wherein the first strip becomes convex at a temperature higher than the first temperature. 3. The tube support structure of claim 1, wherein the first strip is thinner than the second strip. 4. The tube support structure of claim 3, wherein the first strip is 0.02 inches thick and the second strip is 0.08 inches thick. 5. The tube support structure of claim 1, wherein the first strip is attached to the second strip via spot welding. 6. The tube support structure of claim 1, wherein the tube diameter is about 0.5 inches and the first strip is attached to the second strip at spaced intervals of about 1 inch. 7. The tube support structure of claim 1, wherein the first strip is made of SB-166 1690 and the second strip is made of SA 240 type 410S. 8. The tube support structure of claim 1, wherein said tube support structure is operational at a temperature of about 550 degrees F. 9. The tube support structure of claim 1, wherein the tube support bar is a low-bar of a lattice tube support bar array. 10. The tube support structure of claim 1, wherein the tube support bar is a high-bar of a lattice tube support bar array. 11. A tube support structure for use within an array of heat exchanger tubes, each tube having a diameter and a longitudinal axis, the tube support structure comprising: a tube support bar for use between a pair of heat exchanger tubes, the support bar comprised of a first metallic strip attached to a second metallic strip at spaced intervals, the first strip having a coefficient of thermal expansion greater then the second strip, a third metallic strip attached to the second metallic strip opposite the first metallic strip at spaced intervals, the third strip having a coefficient of thermal expansion greater than the second strip. 12. A support for heat transfer tubes in a steam generator, the support comprising: a plurality of bars installed between the heat transfer tubes so that a gap exists between the bars and the heat transfer tubes; a spring means welded to at least one of the bars at intervals, the spring means having a thinner thickness than the bar; and wherein the spring means and the bar have different thermal expansion coefficients so that at a non-operating temperature of the steam generator the spring means does not contact the adjacent tube and at the operating temperature of the steam generator the spring means contacts the adjacent heat transfer tube.