Post by getitone on Nov 27, 2017 1:00:02 GMT -8
Hi, I know tis is probably an a question that is pretty old but as a newbie I'd like to ask it nonetheless. Is it possible to use metal in the heat riser? I've got some amazing steel sheets to work with and would like to try it out.
I have found an amazing list of steels and their properties:
I have heard that while steel (and other metals) are only liquid at very high temperatures (~2500°F) they do start to erode at temperatures starting around a much lower temperature. I've seen pictures where people have used steel and their rockets have eroded a LOT. My question now is if it's possible to use some kind of surface hardening? I know that galvanizing doesn't work as it only improves corrosion resistance. But is it possible to for example boronize stainless steel? Apparently it improves stability at high temperatures.
I have found an amazing list of steels and their properties:
STAINLESS STEEL AISI 304
Alloy with 18% Cr and 8% Ni is the material most used in the manufacturing of industry due
to its excellent resistance to corrosion, low cost and availability in the market. Its maximum operating
temperature is 1400° F (760° C). Due to Stress and Intergranular Corrosion, its continuous service
temperature is limited to 790° F (420° C).
Approximate Hardness: 160 HB.
STAINLESS STEEL AISI 304L
It has the same resistance to corrosion as the AISI 304. Since its Carbon content is limited to 0.03%,
it has less Intergranular Carbon precipitation and therefore less Intergranular Corrosion. Its
operational limit for continuous service is 1400° F (760° C). It is susceptible to Stress Corrosion.
Approximate Hardness: 160 HB and in some cases,140 HB.
STAINLESS STEEL AISI 316
This alloy with 18% Ni, 13% Cr and 2% Mo, offers excellent resistance to corrosion. It can have
carbonate precipitation at temperatures between 860° F (460° C) and 1650° F (900° C), under severe
corrosion conditions. Maximum recommended temperature for continuous service is 1400° F (760 C).
Approximate Hardness: 160 HB.
STAINLESS STEEL AISI 316L
It has the same chemical composition as the AISI 316 but its Carbon content is limited to 0.03%,
which inhibits the Intergranular Carbon precipitation and consequently, the Intergranular Corrosion.
The maximum service temperature is 1400° F (760° C).
Approximate Hardness: 160 HB.
STAINLESS STEEL AISI 321
Austenitic stainless steel alloy with 18% Cr and 10% Ni stabilized with Ti, which reduces the
Intergranular Carbon precipitation and also the Intergranular Corrosion. It can be used in
temperatures up to 1500°F (815°C).
Approximate Hardness: 160 HB.
STAINLESS STEEL AISI 347
Alloy similar to the AISI 304 stabilized with Cb and Ta to reduce
carbonate precipitation and
Intergranular Corrosion. It is subject to
Stress Corrosion. Has good performance in high temperature
corrosive
service. Maximum temperature: 1550° F (815° C).
Approximate Hardness:
160 HB.
Alloy with 18% Cr and 8% Ni is the material most used in the manufacturing of industry due
to its excellent resistance to corrosion, low cost and availability in the market. Its maximum operating
temperature is 1400° F (760° C). Due to Stress and Intergranular Corrosion, its continuous service
temperature is limited to 790° F (420° C).
Approximate Hardness: 160 HB.
STAINLESS STEEL AISI 304L
It has the same resistance to corrosion as the AISI 304. Since its Carbon content is limited to 0.03%,
it has less Intergranular Carbon precipitation and therefore less Intergranular Corrosion. Its
operational limit for continuous service is 1400° F (760° C). It is susceptible to Stress Corrosion.
Approximate Hardness: 160 HB and in some cases,140 HB.
STAINLESS STEEL AISI 316
This alloy with 18% Ni, 13% Cr and 2% Mo, offers excellent resistance to corrosion. It can have
carbonate precipitation at temperatures between 860° F (460° C) and 1650° F (900° C), under severe
corrosion conditions. Maximum recommended temperature for continuous service is 1400° F (760 C).
Approximate Hardness: 160 HB.
STAINLESS STEEL AISI 316L
It has the same chemical composition as the AISI 316 but its Carbon content is limited to 0.03%,
which inhibits the Intergranular Carbon precipitation and consequently, the Intergranular Corrosion.
The maximum service temperature is 1400° F (760° C).
Approximate Hardness: 160 HB.
STAINLESS STEEL AISI 321
Austenitic stainless steel alloy with 18% Cr and 10% Ni stabilized with Ti, which reduces the
Intergranular Carbon precipitation and also the Intergranular Corrosion. It can be used in
temperatures up to 1500°F (815°C).
Approximate Hardness: 160 HB.
STAINLESS STEEL AISI 347
Alloy similar to the AISI 304 stabilized with Cb and Ta to reduce
carbonate precipitation and
Intergranular Corrosion. It is subject to
Stress Corrosion. Has good performance in high temperature
corrosive
service. Maximum temperature: 1550° F (815° C).
Approximate Hardness:
160 HB.